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Dark Chocolate Raspberry Mousse Cake

This Dark Chocolate Raspberry Mousse Cake features moist dark chocolate cake layers, a tangy raspberry filling, and a silky dark chocolate mousse. A show-stopping dessert perfect for special occasions, combining rich chocolate flavor with fresh berry brightness.
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Prep Time 30 minutes
Cook Time 30 minutes
Total Time 1 hour
Servings: 10 Slices
Ingredients Method Notes

Ingredients
  

  • Dark Chocolate Cake
  • 1¾ cups all-purpose flour
  • ¾ cup dark cocoa powder
  • 2 teaspoons baking powder
  • 1 teaspoon baking soda
  • ½ teaspoon salt
  • 1 cup granulated sugar
  • ½ cup brown sugar
  • ½ cup vegetable oil
  • 2 large eggs
  • 1 cup buttermilk
  • 1 cup hot coffee or hot water
  • 2 teaspoons vanilla extract
  • Raspberry Filling
  • 2 cups fresh or frozen raspberries
  • ¼ cup granulated sugar
  • 1 tablespoon lemon juice
  • Dark Chocolate Mousse
  • 8 oz dark chocolate chopped
  • 1½ cups heavy whipping cream
  • 2 tablespoons powdered sugar
  • 1 teaspoon vanilla extract

Method
 

  1. Make the Chocolate Cake
  2. Preheat oven to 350°F (175°C). Grease and line two 8-inch round cake pans.
  3. In a bowl, whisk flour, cocoa powder, baking powder, baking soda, and salt.
  4. In a large bowl, mix granulated sugar, brown sugar, oil, and eggs until smooth.
  5. Add buttermilk and vanilla extract.
  6. Gradually mix in dry ingredients, then stir in hot coffee until smooth.
  7. Divide batter evenly between pans and bake for 25–30 minutes.
  8. Cool cakes completely on a wire rack.
  9. Prepare Raspberry Filling
  10. In a saucepan, combine raspberries, sugar, and lemon juice.
  11. Simmer over medium heat until thickened, about 8–10 minutes.
  12. Remove from heat and let cool completely.
  13. Make the Chocolate Mousse
  14. Melt dark chocolate over a double boiler or microwave. Let cool slightly.
  15. Whip heavy cream with powdered sugar and vanilla to soft peaks.
  16. Gently fold melted chocolate into whipped cream until smooth.
  17. Assemble the Cake
  18. Place one cake layer on a serving plate or springform pan.
  19. Spread raspberry filling evenly over the cake.
  20. Add a thick layer of chocolate mousse.
  21. Top with second cake layer and cover with remaining mousse.
  22. Chill for at least 4 hours before serving.

Notes

Use high-quality dark chocolate (60–70% cocoa) for best flavor.
Chill the cake overnight for cleaner slices and firmer mousse.
Frozen raspberries work perfectly for the filling.
Decorate with fresh berries, chocolate shavings, or cocoa powder.
Store leftovers covered in the refrigerator for up to 3 days.