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Chocolate Mousse Cake

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Indulge in the ultimate chocolate lover’s dream with this Chocolate Mousse Cake. Featuring a moist, rich dark chocolate cake base and a creamy, dreamy chocolate mousse topping, this dessert is elegant, irresistible, and perfect for special occasions or a decadent treat anytime.

Ingredients

  • For the Chocolate Cake:
  • All-purpose flour
  • Granulated sugar
  • Unsweetened cocoa powder
  • Baking soda
  • Baking powder
  • Kosher salt
  • Buttermilk
  • Vegetable oil
  • Large eggs
  • Vanilla extract
  • Hot water
  • For the Chocolate Mousse:
  • Mini marshmallows
  • Semisweet baking chocolate (chopped)
  • Milk
  • Cold heavy whipping cream
  • Vanilla extract

Instructions

  • Prepare the Cake:
  • Preheat oven to 350°F (175°C). Grease a 9×13-inch metal baking pan.
  • In a medium bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt.
  • In a large bowl, whisk together buttermilk and vegetable oil.
  • Add eggs one at a time, whisking well after each.
  • Gradually stir in the dry ingredients until just combined.
  • Add hot water and vanilla extract, whisking until smooth.
  • Pour batter into prepared pan and bake for 30–40 minutes, or until a toothpick comes out clean.
  • Let the cake cool completely.
  • Prepare the Chocolate Mousse:
  • In a saucepan, combine mini marshmallows, chopped chocolate, and milk.
  • Cook over low heat, stirring constantly, until smooth. Let cool completely.
  • In a separate bowl, beat cold heavy cream with vanilla extract until soft peaks form.
  • Fold whipped cream gently into the cooled chocolate mixture.
  • Assemble the Cake:
  • Spread the chocolate mousse evenly over the cooled cake.
  • Refrigerate for at least 30 minutes before serving.

Notes

  • Use milk chocolate instead of semisweet for a sweeter mousse.
  • No buttermilk? Mix 1 cup milk with 1 tbsp lemon juice or vinegar, let sit 5–10 minutes.
  • Store leftovers covered in the fridge for up to 5 days.