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Rich chocolate mousse brownies with a fudgy brownie base and creamy whipped chocolate topping, finished with chocolate shavings.

Chocolate Mousse Brownies

A rich, fudgy brownie base topped with a cloud-like chocolate mousse that feels indulgent and comforting in every bite.
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Prep Time 25 minutes
Cook Time 30 minutes
Total Time 55 minutes
Servings: 12
Course: Dessert, Snack
Cuisine: American, Baking
Calories: 383
Ingredients Equipment Method Nutrition Notes

Ingredients
  

  • ¾ cup butter salted and melted gently
  • 1 ½ cups granulated sugar white sugar for sweetness and structure
  • 1 tablespoon vanilla extract pure vanilla for best flavor
  • 2 large eggs room temperature for smooth mixing
  • ¾ cup all-purpose flour properly measured to avoid cakey texture
  • ½ cup unsweetened cocoa powder natural cocoa for deep chocolate taste
  • ½ teaspoon salt balances sweetness
  • ¾ cup miniature marshmallows used to create mousse structure
  • 4 ounces semi-sweet baking chocolate chopped for even melting
  • ¼ cup milk any variety works
  • 1 cup heavy whipping cream very cold for whipping

Equipment

  • 1 9×9-inch baking pan Creates thick brownies with a fudgy center
  • 1 Parchment paper or cooking spray Prevents sticking and helps with easy removal
  • 1 Large saucepan Used for melting butter and mixing brownie batter
  • 1 Medium saucepan Ideal for melting marshmallows and chocolate smoothly
  • 1 Mixing bowl Needed for whipping the cream for the mousse
  • 1 Whisk Ensures batter is mixed evenly without overworking
  • 1 Electric mixer or hand mixer Helps whip cream quickly to stiff peaks
  • 1 Rubber spatula Perfect for folding mousse and smoothing the topping

Method
 

  1. Preheat the oven to 350°F and prepare a 9×9-inch pan with parchment or grease.
  2. Melt the butter slowly in a large saucepan over medium heat.
  3. Lower the heat and stir the sugar into the butter, cooking while stirring for 2–3 minutes.
  4. Remove the pan from heat and blend in the vanilla extract.
  5. Allow the mixture to rest for about five minutes to cool slightly.
  6. Whisk the eggs into the mixture until fully combined and glossy.
  7. Stir in the flour, cocoa powder, and salt just until no dry streaks remain.
  8. Spread the batter evenly into the prepared pan.
  9. Bake until the edges are set and a toothpick inserted shows moist crumbs, about 20–30 minutes.
  10. Let the brownies cool completely in the pan before topping.
  11. Place marshmallows, chopped chocolate, and milk into a saucepan over low heat.
  12. Stir continuously until melted and smooth, then remove from heat and cool fully.
  13. Whip the cold heavy cream in a bowl until stiff peaks form.
  14. Gently fold the cooled chocolate mixture into the whipped cream.
  15. Spread the mousse evenly over the cooled brownies.
  16. Refrigerate for at least 30 minutes before slicing and serving.

Nutrition

Serving: 95gCalories: 383kcalCarbohydrates: 41gProtein: 3gFat: 23gSaturated Fat: 14gPolyunsaturated Fat: 1gMonounsaturated Fat: 6gCholesterol: 85mgSodium: 222mgPotassium: 152mgFiber: 2gSugar: 30gVitamin A: 700IUVitamin C: 0.1mgCalcium: 38mgIron: 1.6mg

Notes

These brownies are even better the next day when the mousse has fully set and the flavors deepen. Perfect for sharing, though you may find it hard not to sneak an extra square.

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