Triple Chocolate Mousse Cake is the perfect light dessert recipe. It’s made with a chocolate cake base, cool creamy mousse filling and topped with rich dark chocolate ganache.
Triple Chocolate Mousse Cake
The chocolate mousse filling adds a cool creamy texture which compliments the dense chocolate cake layer. It’s smooth, velvety, and extraordinarily decadent.
This cake has loads of chocolate from top to bottom. The cool, rich texture makes it great for any special occasion or holiday.
I recently came across a chocolate mousse layer cake with ganache on The Food Network and decided to make my own version with one single chocolate cake layer, chocolate filling, and dark chocolate ganache.
I changed the above-mentioned recipe drastically and really only used it for inspiration. I found I needed to add a little gelatin to the mousse layer in order to keep it sturdy. I didn’t want it to spread and drip over the edges.
I left the ganache semisweet which balances well with the sweet cake and mousse layers.
I served this layered chocolate mousse cake with fresh strawberries but I image it would be good with whipped cream, ice cream, or other fresh berries.
It truly is a decadent mousse cake and will be a huge hit for any occasion. It came out light, rich, and perfect for Mother’s Day. It’s also great for Valentine’s Day if you have someone special to make it for. Or you could make it for yourself.
How to make triple chocolate mousse cake?
Step 1: Melt the chocolate
This method is slightly different for melting chocolate. Pour hot water over finely chopped chocolate and stir until it’s completely melted.
Stir in the cocoa powder and coffee granules. The chocolate will begin to look more like a paste.
Next, add the sugar and keep stirring until the chocolate turns smooth and shiny. Set it aside to cool while you prepare the cake batter.
Step 2: Make the cake
Start by beating the butter and sugar together until pale in color. Beat in the eggs and vanilla followed by the melted chocolate. Mix in the flour and buttermilk.
Bake the cake until a toothpick inserted into the center comes out clean.
Step 3: Make the mousse layer
Bloom gelatin in water then add it to steaming cream and sugar. Pour the hot gelatin mixture over chopped chocolate and stir until chocolate is melted and smooth.
Whip heavy cream to soft peaks then fold it into the chocolate. Spread the chocolate mousse evenly over the cooled cake.
Step 3: Make the topping
Pour warm cream over chopped chocolate and stir until melted and smooth. Spread the ganache over the top of the mousse layer.
Common questions about Triple Chocolate Mousse Cake
I thought water will cause chocolate to seize?
It is fine to mix chocolate with a larger amount of boiling water. Chocolate will seize if it is already melted and you add a tiny bit of water. Here’s a great article to take a look at: Chocolate + Water = Mousse.
Can I make the cake the day before my event and let it sit in the fridge until I serve it?
Yes. The mousse needs time to set so that is perfect.
Can this cake be frozen for a few days?
Yes, it can! Thaw it in the refrigerator a day before serving. Also, let it sit at room temperature for 30 minutes to 1 hour before you plan to serve it.
I don’t have a springform pan. Can I make this cake in a regular cake tin?
A springform pan will certainly make things easier but if you really need to use a regular pan, I suggest freezing the cake before you try to turn it out.
More chocolate cake recipes you’ll love
Triple Chocolate Mousse Cake
For the cake
- 3 ounces (85 grams) unsweetened chocolate, finely chopped
- 1/4 cup (60 milliliters) hot water
- 1 teaspoon instant coffee granules
- 2 tablespoons unsweetened Dutch-processed cocoa powder
- 3/4 cup (150 grams) granulated sugar
- 6 tablespoons unsalted butter, softened
- 2 large eggs
- 2 large egg yolks
- 1 teaspoon vanilla extract
- 3/4 cup (97 grams) all-purpose flour
- 3/4 teaspoon baking soda
- 1/2 teaspoon salt
- 1/2 cup (120 milliliters) buttermilk
For the mousse
- 3/4 teaspoon gelatin powder
- 1 tablespoon (1 tablespoons) water
- 6 ounces (168 grams) semisweet chocolate, coarsely chopped
- 2 tablespoons granulated sugar
- 1 and 1/2 cups (360 milliliters) cold heavy cream
For the ganache
- 3/4 cups (180 milliliters) heavy cream
- 1 tablespoon unsalted butter
- 9 ounces (252 grams) semisweet chocolate, coarsely chopped
Make the cake:
- Adjust the oven rack to the middle of the oven and heat to 350ºF. Lightly grease and flour an 8-inch springform pan. Tap out any excess flour.
- Place the chocolate in a small heatproof bowl. Bring water to a boil and pour it over the chocolate. Stir with a silicone spatula until the chocolate is melted and smooth, about 2 minutes. Stir in the coffee granules and cocoa powder. (The chocolate will begin to look more like a paste at this point.) Add 1/4 cup of the sugar and stir until thick and glossy, about 2 minutes.
- In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and remaining sugar together until light and fluffy. Beat in the eggs and egg yolks, one at a time, mixing well after each addition. Beat in the vanilla. Add the chocolate mixture and mix until thoroughly combined.
- In a small bowl, combine the flour, baking soda, and salt. Stir with a whisk. Add half of the flour mixture to the chocolate mixture, followed by the buttermilk, mixing until incorporated. Add remaining flour mixture and mix until the batter is thoroughly combined.
- Spread the batter into the bottom of the prepared pan, smoothing it to the edges with a spatula. Bake for 25 to 30 minutes or until a toothpick inserted into the center comes out clean. Cool to room temperature in the pan on a wire rack.
Make the mousse:
- In a small bowl, sprinkle the gelatin over water, let stand for 5 minutes. Place chocolate and sugar in a medium bowl. Bring 1/2 cup of the cream to a simmer in a small saucepan over medium-high heat.
- Remove from heat; add the softened gelatin and stir until fully dissolved. Pour the cream over the chocolate and whisk until chocolate is melted and the mixture is smooth. Cool to room temperature, stirring occasionally. The mixture will thicken slightly.
- In the bowl of a stand mixer fitted with the whisk attachment, whip the remaining 1 cup cream at medium speed until it begins to thicken, about 30 seconds. Increase the speed to high and whip until soft peaks form, about 30 to 60 seconds.
- Use a whisk to mix in 1/3 of the whipped cream into the chocolate mixture. Use a rubber spatula to fold the remaining whipped cream into the chocolate mixture until no streaks appear.
- Spoon the chocolate mousse into the pan over the chocolate cake. Smooth the top with an offset spatula. Return the cake to the refrigerator and chill until set, about 2 hours.
Make the ganache:
- Heat the cream and butter in a medium saucepan over medium-high heat. Remove from heat just before it begins to boil.
- Place the chocolate in a medium heatproof bowl and pour the hot cream over the chocolate. Stir until chocolate is melted and smooth. Cool to room temperature.
- Spread the ganache over the top of the mousse layer and refrigerate until set. About 45 minutes.
- Run a knife along the outer edge of the cake to loosen it from the pan and gently remove from the pan. Serve with whipped cream or fresh berries.
Make ahead tip
- The cake will keep for up to 3 days stored in the refrigerator.
- The cake can be frozen up to 3 months. Thaw in the refrigerator overnight before serving.