1. Chocolate Cake Base:
- Preheat your oven to 350°F (175°C). Grease and line the bottom of a 9-inch (23cm) springform pan.
- In a large bowl, whisk together sugar, flour, cocoa powder, baking powder, baking soda, and salt.
- Add eggs, milk, oil, and vanilla extract. Mix until well combined.
- Stir in the boiling water until the batter is smooth. It will be thin, but that’s okay.
- Pour the batter into the prepared pan and bake for 30-35 minutes or until a toothpick inserted into the center comes out clean. Allow the cake to cool completely.
2. Dark Chocolate Mousse Layer:
- Melt the dark chocolate in a heatproof bowl over simmering water or in the microwave. Allow it to cool slightly.
- Whip the heavy cream and sugar until stiff peaks form.
- Gently fold the melted chocolate into the whipped cream until well combined.
- Spread the dark chocolate mousse over the cooled chocolate cake. Refrigerate while you prepare the next layer.
3. Milk Chocolate Mousse Layer:
- Repeat the process for the milk chocolate layer using the ingredients listed for the milk chocolate mousse.
- Carefully spread the milk chocolate mousse over the dark chocolate layer. Refrigerate again.
4. White Chocolate Mousse Layer:
- Repeat the process for the white chocolate layer using the ingredients listed for the white chocolate mousse.
- Spread the white chocolate mousse over the milk chocolate layer.
5. Chill:
- Cover the cake with plastic wrap and refrigerate for at least 4 hours or preferably overnight to allow the mousse to set.
6. Serve:
- Before serving, you can garnish the cake with chocolate shavings, cocoa powder, or fresh berries if desired.
Enjoy your Triple Chocolate Mousse Cake!