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Learn how to make the silkiest Swiss meringue buttercream with this step-by-step tutorial and video. You’ll never want any other type of frosting after you try this one!

swill buttercream swirled on top of cupcake

Homemade swiss meringue buttercream

Swiss buttercream is a lightly sweetened frosting made by incorporating butter into a meringue base. It’s less sweet than my American vanilla buttercream but has the same light and fluffy texture.

Meringue buttercreams can be finicky, though. You must use proper technique to ensure the frosting comes together as it should. But overall it is quite simple to make.

I prefer Swiss meringue frostings over Italian or French because I find it to be much easier to work with.

Italian and French meringue requires you to pour hot sugar syrup into the egg whites. While Swiss meringue is made by heating the egg whites and sugar over a double boiler.

If you haven’t made meringue buttercream before, I highly suggest you start with this Swiss version. I’ll walk you through exactly how to get perfect frosting every time.

Once you’ve mastered this basic version, try adding chocolate for a luscious chocolate Swiss frosting or strawberry powder for a smooth strawberry frosting.

Why this recipe works:

  • The egg whites are heated so the frosting is 100% safe to eat.
  • The perfect ration of butter to meringue is used to achieve a fluffy, silky frosting.
  • This is a base recipe that can be flavored any way you like!
swiss buttercream on a red spatula

How to make swiss meringue buttercream

Swiss meringue frosting is so much easier than you may think! It’s made by cooking egg whites and sugar over a double boiler, whipping them into a meringue, then adding butter. You can flavor and color the frosting any way you like.


Ingredients

Swiss meringue buttercream frosting only requires three ingredients. These ingredients make up the base of the frosting. Then you can choose your flavoring. Let’s go over everything in detail.

  • Egg whites: When separating the egg whites, make sure they are completely free of any yolk. Just a small trace of yolk can prevent the whites from whipping up.
  • Sugar: Regular granulated sugar is all you need.
  • Butter: Unsalted sweet cream butter will work best. Choose a quality brand because you will taste the butter in the frosting.
  • Salt: I like to add just a pinch of salt to my frostings.
  • Vanilla extract: This is a vanilla-flavored buttercream so I chose to use pure vanilla extract*. A vanilla paste will also work if you prefer a deeper flavor.

Equipment

To bake this frosting you’ll need:

  • Stand mixer: A stand mixer* is best for making meringue buttercream.
  • Whisk attachment: You’ll need the whisk attachment* for the stand mixer.
  • Whisk: A large balloon whisk* is great when heating the egg whites.
  • Silicone spatula: A large silicone spatula* is also great for scraping down the sides of the bowl.
piping swiss meringue buttercream on cupcakes

Instructions

The process of making Swiss buttercream is simple and straight forward. But, you will want to make sure you are following the steps precisely or you risk running into issues with the frosting.

Step 1: Gather the ingredients

Start by measure out all the ingredients. The process for making the frosting moves quickly and you don’t want to be fiddling with measuring things as you go. Prep them before you begin and have them set out at your work station.

The egg whites don’t have to be at room temperature since they will be heated. Plus, cold eggs are easier to separate.

Take extra care when separating the yolks from the whites. If a small trace of yolk gets into the whites, they won’t whip up properly and you’ll need to start over.

The butter must be at room temperature. Not melty but soft enough for you to press a finger into. If the butter has a greasy appearance, it’s too soft and will cause the frosting to curdle.

Slice the butter into 1 tablespoon-size pieces and allow it to soften slightly.

Step 2: Heat the egg whites and sugar

I highly recommend using a stand mixer with the metal bowl for this recipe.

Glass bowls retain heat longer. This will increase the amount of time needed to let the meringue cool down.

Also, the amount of mixing required is easier with a stand mixer. If you must use a hand-held electric mixer, make sure it is high powered enough to whip the egg whites into a meringue.

It’s also good practice to thoroughly wash and dry the bowl and beaters to ensure they are clean and free of any grease. The smallest trace of oil will prevent the egg whites from whipping up.

Place the egg whites, sugar, and salt in the bowl of a stand mixer and set it over a pot of barely simmering water. The pot should only have about 1-inch of water in it.

heating egg whites and sugar in glass bowl

Whisk gently but continuously as you heat the mixture. The mixture should reach a temperature of 150°F on an instant-read thermometer.

Carefully dip the tip of a clean finger into the mixture and rub it between your fingers. It shouldn’t feel gritty. If it does feel gritty, keep cooking until the sugar is fully dissolved.

Step 3: Whip the meringue

Transfer the mixing bowl to the stand mixer and fit the mixer with the whisk attachment.

Turn the mixer to medium speed and beat the mixture until it is the consistency of shaving cream and has cooled slightly. The outside of the bowl should no longer feel warm. If it’s too warm, the butter will meld and curdle the frosting.

This is why it is recommended to use a metal bowl. It won’t retain heat quite as long as a glass bowl will. I use glass bowls and they take forever to cool down!

meringue on a whisk attachment

Step 4: Add the butter

One the meringue has cooled some, it’s time to add the butter.

Leave the mixer running on medium speed and add the butter, one tablespoon at a time. Don’t add the next tablespoon until the previous one is fully mixed in.

butter added to meringue for buttercream

As you add more and more butter, the frosting will begin to change in appearance. It can even look curdled. Just keep adding the butter and let it mix. It will come together in the end.

Once all the butter is added, stop and scrape down the sides of the bowl. Turn the speed up to medium-high and whip until the frosting is light and fluffy. This should only take about 30 seconds.

Some recipes call for switching to a paddle attachment when you add the butter. I’ve found that it’s not completely necessary and only dirties up another utensil.

As long as you are not running the mixer on high speed, the whisk attachment is fine to use throughout the entire process.

whipped swiss buttercream frosting in a glass bowl

Step 5: Add the flavoring

Add the vanilla or any other flavoring you desire and mix on medium-high speed until it’s fully incorporated.

You may also wish to color the frosting at the point. Use oil candy coloring and add only a small amount at a time.

swiss meringue buttercream in a glass mixing bowl with red spatula

Why won’t my meringue whip up?

If your meringue won’t whip to stiff peaks, it’s possible the egg whites were contaminated with yolk or the bowl and beaters had trace amounts of oil present. Unfortunately, you’ll need to scrape this batch and start again.

Why does my swiss meringue buttercream look curdled?

It’s common for SMBC to curdle during the process of adding the butter but it usually comes together with a little extra mixing.

Make sure you add the butter 1 tablespoon at a time and only add the butter as fast as it can be absorbed. Once all the butter is added, let the frosting mix and it will come together.

Sill curdled?

If you followed the steps above and the frosting is still curdled, it’s possible the butter was too cold.

Leave the mixer running on medium-high speed and use a hairdryer to heat the outside of the bowl. This will warm the butter just enough to allow it to mix in.

Once it starts coming together, turn the hairdryer off and continue beating until the frosting is light and fluffy.

Why is my swiss meringue buttercream soupy?

Runny SMBC is a result of the ingredients being too warm. Either the meringue was too warm when you added the butter or the butter was too soft.

Remember to let the meringue cool before adding the butter. The outside bottom of the mixing bowl shouldn’t feel warm when you touch it.

And the butter shouldn’t be so softened that it looks greasy. It should be around 68°F. It will be soft enough to press a finger into but not melty.

If you find yourself with soupy swiss buttercream, don’t fret. It’s completely salvageable. Just pop the bowl of frosting into the refrigerator for 15-20 minutes. Then continue whipping.

How do I make my swiss meringue buttercream white?

Swiss buttercream will have an off white appearance due to the amount of butter. You can neutralize the yellowish tint by adding the smallest amount of violet food coloring*.

Dip a toothpick into the coloring then dab only a pinpoint amount into the buttercream. Whip the frosting and the yellow tint will fade away.

You may need to add a little more but do this sparingly. You can always add a little more but you can’t take it out once it’s in.

How do you dye swiss meringue buttercream?

I’ve found that oil candy color* works best for tinting meringue buttercream. Work with 2-3 drops at a time and mix it in once all the butter has been added.

If you only have access to gel food coloring*, you’ll want to tint the meringue before you add the butter. Otherwise, you risk having specks of color throughout the frosting.

How do I make my swiss meringue buttercream a different flavor?

Once you’ve added all the butter and whipped the frosting until it is light and fluffy, you can add any flavoring or extracts you like. Here are a few of my favorite.

  • Mix in melted and cooled chocolate.
  • Use a food processor to grind freeze-dried fruit into a fine powder. Mix the powder into the buttercream.
  • Stir in citrus zest.
  • Mix in espresso or cappuccino powder.
  • Mix in spices like ground cinnamon, nutmeg, or ginger.
  • Use any extract flavor.

How to store swiss meringue buttercream

You can store the frosting in an airtight container for up to 1 day before you plan to use it. Allow it to come to room temperature then re-whip before using.

The frosting can also be frozen for up to 2 months. Thaw it in the refrigerator overnight then let it come to room temperature and re-whip before using.

Cakes or cupcakes frosted with SMBC can be left out at room temperature in an airtight container for 2-3 days. Or store them in the refrigerator for up to 1 week.

close up of swiss meringue buttercream swirled on top of cupcake

Great ways to use swiss meringue buttercream

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piping swiss meringue buttercream on cupcakes

Swiss Meringue Buttercream

Yield: 4 ½ cups
Prep Time: 15 minutes
Cook Time: 10 minutes
Total Time: 25 minutes

Learn how to make the silkiest Swiss meringue buttercream with this step-by-step tutorial and video. You’ll never want any other type of frosting after you try this one!

Ingredients

  • 1 cup (200 g) granulated sugar
  • 4 (140 g) large egg whites
  • ¼ teaspoon salt
  • 1 ½ cups (339 g) unsalted butter, cut into pieces, room temperature - SEE NOTE 1
  • 1 teaspoon vanilla extract

Instructions

  1. Combine the sugar, egg whites, and salt in the bowl of a stand mixer. Set the bowl over a saucepan filled with 1 inch of barely simmering water. Whisk gently and continuously while heating the mixture. It should register 150°F on an instant-read thermometer. The sugar should be fully dissolved.
  2. Transfer the bowl to the stand mixer and fit it with the whisk attachment. Beat on medium speed until the mixture is the consistency of shaving cream and cooled slightly, 1-2 minutes. (if the meringue is warm it will melt the butter.)
  3. Gradually add the butter, 1 tablespoon at a time, until smooth and creamy. (Only add the next tablespoon of butter once the last one has been completely mixed in.)
  4. Once all the butter is added, scrape down the sides of the bowl and mix on medium-high and beat until light and fluffy, about 30 seconds.
  5. Add the vanilla and continue to mix on medium-high until incorporated.

Notes

  1. The butter must be softened to about 60°F. It should be soft enough to press an indent with your fingertip but not so soft that it is greasy or melty. Butter that is too soft will turn the frosting into soup.
  2. Do not begin adding the butter until the meringue has cooled completely! If the meringue is warm, it will melt the butter and turn the frosting into soup.
  3. If your frosting curdles and won't smooth out with 5 minutes of mixing, don't panic. You can salvage it by heating the side of the bowl with a hairdryer while the mixer is running. Do this until the frosting starts coming together, turn the hairdryer off and continue beating until the frosting is light and fluffy. Or you can place about ⅓ cup of curdled frosting into a microwave-safe bowl and microwave it for about 15-30 seconds. Give it a good whisk then add it back to the main bowl of frosting. Beat on medium speed until the frosting comes together.
  4. If your frosting is loose and soupy, it can be salvaged by placing the bowl and whisk attachment in the refrigerator for about 20 minutes. Then rewhip the frosting until it is light and fluffy.

The recipe makes enough to frost 24 cupcakes or a two-layer 9-inch cake.

Make ahead tip

  1. The frosting can be made 1 day in advance. Keep refrigerated in an airtight container. Bring to room temperature and re-whip before using it.
  2. The frosting can also be frozen for up to 2 months. Thaw it in the refrigerator overnight then let it come to room temperature and re-whip before using.
  3. Cakes or cupcakes frosted with SMBC can be left out at room temperature in an airtight container for up to 3 days. Or store them in the refrigerator for up to 1 week.

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Nutrition Information:
Yield: 24 Serving Size: 1
Amount Per Serving: Calories: 137Total Fat: 12gSaturated Fat: 7gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 31mgSodium: 33mgCarbohydrates: 8gFiber: 0gSugar: 8gProtein: 1g

* Percent Daily Values are based on a 2000 calorie diet. Since different brands of ingredients have different nutritional information, the values shown are just an estimate.

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Slightly adapted by The Cake Bible, page 236.

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36 Comments

  1. Denise Holmes says:

    Would like to include melted white chocolate in the recipe. How many grams would you suggest please.

  2. Brittany Diamond says:

    Mine came out to about 2 cups of frosting.. did I not whip it enough?

    1. The volume of the whipped egg whites can depend on so many factors. Eggs vary in size/weight, the age of the egg, altitude, humidity… This all will affect how much the meringue whips up.

  3. If I wanted to make this a lemon frosting would you use a lemon powder or lemon zest/juice?

    Thanks!

  4. Molly Leebens says:

    I’ve washed and re-washed twice, and I’m still not getting my meringue to whip up? I know your note says there could be trace amounts of oil, so each time I try, I am re-washing and trying completely but it’s still not working. I’ve tossed out two batches already. Is there something else I need to do differently for my 3rd try?

    1. Is it possible you’re getting a bit of yolk in the whites? This can also inhibit the whites from whipping up. What type of mixer are you using? I find that the handheld mixers don’t work as well unless they’re super powerful. You can also try gradually bumping up the speed on your mixer until the meringue starts to thicken.

      1. I always pour a couple T. real lemon juice in my mixer. Wipe down inside bowl with paper towel. Use wet paper towel to wipe the beaters as well.

  5. Hi! I made this frosting once and it came out really nice. I have this organic strawberry powder that I was thinking I could use in the frosting to flavor it. Would this work?

    1. @Jen Sobjack, How much should I use and when should I put it in? Trying to find the right SMBC recipe to go with is extremely difficult. I’m getting a headache at this point, lol. I have yet to come across 2 recipes that are the same (even when the recipes are making the same amount) but yours is the closest I’ve come to finding that’s almost the same as one other. It’s crazy how different everyone’s recipes are…

    2. Hi Jen. Thanks for the reply. I made your strawberry SMBC the following day. I did go by your strawberry recipe but I had to add quite a bit more of the strawberry powder because the flavor was mild but it worked out well because the bag I had opened had I not used it up it would have gone to waste. The frosting was delicious, smooth and yes, silky. This made enough for me to ice a 2 9in layer cake and also being able to put a border around the bottom layer then to use on top of my curd filling. There wasn’t enough left to do any decor but if I were to 1.5x this recipe I know that will be more than enough. I’m planning to make it again today but this time flavor it coconut. I’ve made a SMBC using Yolanda Gampps recipe where she added coconut cream to the frosting to taste. Just wanted to let others know they can make this a coconut flavor without having to use an extract. If you chose to do so just start off slowly with the coconut cream and stop once you get the intensity of flavor you’re trying to achieve. Another tip. She had us mix in the coconut cream by folding it in. That’s how I’ve always done it so if you try to whip it in I can’t tell you how that’s going to work. You can also add about a 1/2 of Biscoff. Just make sure to warm it up to thin it out then let it cool off some. If you’re a fan of Biscoff you’re going to love Biscoff SMBC… ?

  6. It was really good till I added butter than it came loose and soupy ☹️ I don’t know what I did wrong because I also left the bowl to get cold before

    1. This can also happen if the butter is too warm. To remedy this, just pop the bowl of frosting in the fridge for about 20 minutes then continue whipping. There are troubleshooting tips in the blog post above.

  7. can you use meringue powder instead of fresh egg whites

  8. Oops.. one more question. I think I would l Iike to add a small amount of almond extract. What would you recommend?

    1. 1/4 teaspoon of almond extract is probably a good amount. Almond extract can be a bit strong so start small, taste, and add a little more if needed.

  9. I tend to have a little bit of a heavy hand with frosting. Would it be okay if I doubled this recipe? Or is this a pretty generous amount of frosting on it’s own.

    1. This recipe yields 4 1/2 cups of frosting which is plenty enough to frost 24 cupcakes or a two-layer 9-inch cake. You’ll need to adjust it depending on how much you typically use for the size cake you are decorating.

      1. Thanks! I’m doing 2 9 inch rounds. I’ll stick with the recipe as is.

  10. Thank you for the recipe, is it possible to get the egg white in grams as size of eggs differ?

    1. I never weigh the egg. I just used the whites from 4 large eggs purchased from my grocery store. But according to online conversions, 1 egg white is roughly 35 grams. This means 4 whites will equal about 140 grams.

      1. Thank you, will try that.