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A single square of chocolate mousse brownie on a plate, with a fork taking a bite to show the fudgy brownie base and creamy mousse topping.

Chocolate Mousse Brownies: The Ultimate Decadent Dessert

Indulge in the ultimate dessert experience with these Chocolate Mousse Brownies. A rich, fudgy brownie base topped with a light, airy chocolate mousse and a glossy ganache. This recipe is your guide to creating a show-stopping, multi-layered treat.
Prep Time 30 minutes
Cook Time 30 minutes
Total Time 1 hour
Servings: 16 brownies
Course: Dessert
Cuisine: American
Calories: 350

Ingredients
  

For the Fudgy Brownie Base
  • 1/2 cup unsalted butter melted
  • 1 cup granulated sugar
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 1/2 cup all-purpose flour
  • 1/3 cup unsweetened cocoa powder
  • 1/4 teaspoon salt
For the Silky Chocolate Mousse
  • 1 cup semi-sweet chocolate chips
  • 1 1/2 cups heavy whipping cream cold
  • 1/4 cup powdered sugar
For the Glossy Ganache Topping
  • 1/2 cup semi-sweet chocolate chips
  • 1/2 cup heavy whipping cream

Equipment

  • 1 8x8 inch baking pan
  • 1 Electric Mixer
  • 3 Mixing Bowls

Method
 

Bake the Fudgy Brownies
  1. Preheat oven to 350°F (175°C). Grease and line an 8x8 inch baking pan with parchment paper, leaving an overhang.
  2. In a saucepan, melt the butter over low heat. Remove from heat and stir in the granulated sugar. Whisk in eggs and vanilla extract until smooth.
  3. In a separate bowl, sift together flour, cocoa powder, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
  4. Pour batter into the prepared pan and bake for 25-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs. Cool completely.
Prepare the Chocolate Mousse
  1. Melt 1 cup of semi-sweet chocolate chips in the microwave until smooth. Set aside to cool slightly.
  2. In a large bowl, beat the heavy whipping cream and powdered sugar with an electric mixer until stiff peaks form.
  3. Gently fold about one-third of the whipped cream into the melted chocolate, then fold the lightened chocolate mixture back into the remaining whipped cream until no streaks remain.
Assemble and Finish
  1. Spread the chocolate mousse evenly over the completely cooled brownie base. Refrigerate for at least 4 hours, or until the mousse is firm.
  2. For the ganache, place 1/2 cup of chocolate chips in a heatproof bowl. Heat 1/2 cup of heavy cream until simmering, then pour over the chocolate chips. Let sit for 5 minutes, then whisk until smooth.
  3. Let the ganache cool for 10-15 minutes, then pour over the chilled mousse layer. Refrigerate for another 30 minutes to set the ganache before slicing and serving.

Notes

Tip 1: Ensure brownies are completely cool before adding the mousse to prevent it from melting.
Tip 2: For clean cuts, use a hot, sharp knife wiped clean between each slice.
Tip 3: Using high-quality chocolate will significantly improve the overall flavor of the dessert.