Indulge in the ultimate chocolate experience with this Triple Chocolate Mousse Cake—a rich, moist chocolate cake layered with silky chocolate mousse and topped with a luscious ganache frosting. Perfect for special occasions or any time you crave a chocolate masterpiece!

Ingredients
For the Cake:
- 2 cups all-purpose flour
- 1/2 cup sifted cocoa powder (plus more for dusting)
- 1 1/4 teaspoons baking soda
- 1/4 teaspoon baking powder
- Pinch of salt
- 1 cup mayonnaise
- 1 cup granulated sugar
- 3 large eggs
- 1 1/4 cups water
- 1 teaspoon vanilla extract
For the Ganache Frosting:
- 8 ounces bittersweet chocolate, chopped
- 3/4 cup heavy cream
- 1 1/2 tablespoons corn syrup
For the Chocolate Mousse Filling:
- 1 1/2 teaspoons unflavored gelatin
- 1 tablespoon cold water
- 1 tablespoon boiling water
- 6 ounces bittersweet chocolate, chopped
- 1 1/2 cups heavy cream, divided
- 2 tablespoons granulated sugar
Instructions
Step 1: Bake the Chocolate Cake
- Preheat oven to 350°F (175°C). Grease and flour a 9-inch springform pan.
- In a large bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt.
- In another bowl, beat together the mayonnaise, sugar, eggs, water, and vanilla extract until smooth.
- Gradually add the wet ingredients to the dry ingredients and mix until just combined.
- Pour the batter into the prepared pan and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
- Let the cake cool completely before assembling.
Step 2: Prepare the Chocolate Mousse Filling
- Sprinkle gelatin over cold water and let it sit for 5 minutes to bloom.
- In a separate bowl, melt the chocolate in the microwave or over a double boiler.
- Stir the bloomed gelatin into boiling water until dissolved, then add it to the melted chocolate and mix until smooth.
- In another bowl, whip 1 cup of heavy cream until stiff peaks form.
- Gently fold the whipped cream into the chocolate mixture until fully combined.
Step 3: Make the Ganache Frosting
- Place the chopped bittersweet chocolate in a heatproof bowl.
- In a saucepan, heat heavy cream and corn syrup until just simmering.
- Pour the hot cream over the chocolate and let it sit for 1 minute.
- Stir until smooth and glossy. Let the ganache cool slightly before using.
Step 4: Assemble the Cake
- Place the cooled cake layer on a serving plate.
- Spread a layer of chocolate mousse filling evenly over the cake.
- Chill for 30 minutes to set.
- If desired, repeat with another layer of cake and mousse filling.
- Frost the top and sides of the cake with the ganache frosting.
- Refrigerate for at least 4 hours before slicing and serving.
Serving Suggestions
- Dust the cake with cocoa powder or chocolate shavings for an elegant finish.
- Pair with a scoop of vanilla ice cream or a dollop of whipped cream.
- Serve chilled for the best texture and flavor.
Enjoy this Triple Chocolate Mousse Cake, a true chocolate lover’s dream!