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Decadent Chocolate Mousse Brownies with fudgy base and creamy mousse topping.

Chocolate Mousse Brownies

Fudgy brownies topped with a light chocolate mousse, creating a rich and impressive dessert that feels like a treat from a bakery.
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Prep Time 20 minutes
Cook Time 30 minutes
Total Time 4 hours
Servings: 16 pieces
Course: Dessert
Cuisine: American
Calories: 250
Ingredients Method Notes

Ingredients
  

Brownie Base
  • 1 cup unsalted butter Melted, for the brownie base.
  • 2 cups granulated sugar For sweetness and shiny brownie top.
  • 4 large eggs To bind and provide structure.
  • 1 teaspoon vanilla extract To enhance the chocolate flavor.
  • 3/4 cup unsweetened cocoa powder For deep chocolate flavor.
  • 1 cup all-purpose flour Just enough to hold it together.
  • 1/2 teaspoon salt Enhances flavor.
Chocolate Mousse Topping
  • 8 ounces semi-sweet or dark chocolate Melted and cooled slightly.
  • 1 cup heavy cream Whipped until soft peaks form.
Optional Add-ins
  • 1 teaspoon espresso powder Optional, for deepening chocolate flavor.
  • 1/2 cup chocolate chips For extra texture in brownie base.
  • as needed cocoa powder For dusting the mousse layer.

Method
 

Bake the Brownie Base
  1. Preheat your oven to 350°F (175°C). Line an 8×8 pan with parchment paper for easy lifting.
  2. Melt butter, stir in sugar, then whisk in eggs and vanilla until well combined.
  3. Add cocoa powder, flour, and salt; stir until just combined. Do not overmix.
  4. Spread in the prepared pan and bake until edges are set and a toothpick comes out with moist crumbs.
  5. Let the brownies cool completely.
Make the Chocolate Mousse Topping
  1. Melt chocolate and let it cool until warm but not hot.
  2. Whip cold heavy cream until it holds soft peaks.
  3. Gently fold the melted chocolate into the whipped cream.
  4. Spread the mousse over the cooled brownie layer, smoothing the top.
  5. Refrigerate for at least 3 to 4 hours, or overnight for clean slices.
Slice and Serve
  1. Use a sharp knife and wipe it between cuts for neat slices.
  2. For tidy edges, chill brownies and run the knife under warm water before slicing.

Notes

Cool brownies completely before layering mousse. Use cold cream for whipping. Ensure melted chocolate is warm, not hot, when folding into the whipped cream. Chill long enough for clean slices.