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Chocolate Mousse Brownies

4.6 from 76 votes
Rich chewy brownies, topped with a layer of creamy chocolate mousse and finished off with a drizzle of chocolate.
photo of Danelle, author of Let's Dish
Published on , Updated October 22, 2025
4.6 from 76 votes

Rich chewy brownies, topped with a layer of creamy chocolate mousse and finished off with a drizzle of chocolate.

Chocolate Mousse Brownies

Why You’ll Love This Recipe

As a food blogger, I don’t repeat recipes very often. I’ve made these Chocolate Mousse Brownies twice in the last month. Once for my family and once for a crowd of hungry teenagers.

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This is my second time making these in 3 weeks. They are SO good! I use a glass 8×8 pan and they turn out great. Thank you for the recipe!

Kyleen

5-star rating

They were a big hit with both groups, and for good reason. They are amazing!

The dense, chewy brownies and the light, fluffy chocolate mousse are both fantastic on their own, but together they equal decadent brownie perfection.

And believe it or not, they are really easy to make. The biggest challenge is not eating all the mousse before you put it on the brownies!

Chocolate Mousse Brownies

This is one of those recipes that will wow your friends and family and make them think you spent hours in the kitchen.

Which is fine…..nobody needs to know how easy these decadent brownies are. Don’t be tempted to use a brownie mix, or a different brownie recipe. Trust me, this brownie recipe is perfect for the creamy mousse topping.

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These are super good! I made some for my mum’s police station kitchen, and everyone who ate them said they were amazing!

Elsie

5-star rating

If I want to lighten things up a bit (is that even possible?) I omit the chocolate drizzle and top them with fresh raspberries and a dollop of whipped cream.

If you’re looking for an easy but elegant dessert for a special occasion–or just because–these Chocolate Mousse Brownies are for you!

Be sure to save this recipe to your favorite Pinterest board for later.

Chocolate Mousse Brownies

Ingredients

  • Flour
  • Cocoa
  • Salt
  • Butter 
  • Sugar
  • Vanilla
  • Eggs
  • Miniature marshmallows
  • Chopped chocolate
  • Milk
  • Heavy Cream
Chocolate Mousse Brownies

Chocolate Mousse Brownies

Rich chewy brownies, topped with a layer of creamy chocolate mousse and finished off with a drizzle of chocolate.
4.57 from 76 votes
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Course: Desserts
Cuisine: American
Prep Time: 20 minutes
Cook Time: 30 minutes
Total Time: 50 minutes
Servings: 8 servings
Calories: 573kcal
Author: Danelle

Ingredients 

For the brownies:

  • 3/4 cup flour
  • 1/2 cup cocoa
  • 1/2 teaspoon salt
  • 3/4 cup butter
  • 1 1/2 cups sugar
  • 1 teaspoon vanilla
  • 2 eggs

For the mousse:

  • 3/4 cups miniature marshmallows
  • 4 ounces chopped semi-sweet chocolate
  • 1/4 cup milk
  • 1 cup heavy whipping cream
  • Additional chocolate for garnish optional

Instructions

  • Preheat oven to 350 degrees. Grease a 9-inch square baking pan.
  • In a large bowl, combine flour, cocoa, and salt. Melt butter in a large saucepan and remove from heat. Stir in sugar and vanilla. Quickly whisk in eggs, one at a time.
  • Add butter mixture to flour mixture and stir until well blended. Spread brownie batter into prepared pan and bake for 25-30 minutes. Cool completely.
  • Meanwhile, make the mousse by heating marshmallows, chocolate and milk in a medium saucepan over medium-low heat, stirring often until completely smooth. Cool completely.
  • With an electric mixer, beat whipping cream until stiff peaks form. Stir in cooled chocolate mixture.
  • Spread mousse evenly over cooled brownies. Drizzle with additional melted chocolate, or top with chocolate shavings, if desired.
  • Refrigerate brownies for at least 30 minutes, or until ready to serve. Keep leftover brownies in the refrigerator (this will also make the brownie layer dense and chewy!).

Nutrition

Serving: 1g | Calories: 573kcal | Carbohydrates: 64g | Protein: 6g | Fat: 34g | Saturated Fat: 21g | Polyunsaturated Fat: 11g | Trans Fat: 1g | Cholesterol: 127mg | Sodium: 305mg | Fiber: 2g | Sugar: 49g
Keep scrolling for tips, ingredient substitutions, answers to frequently asked questions and more!

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36 comments

  • Hey I tried this recipe earlier on in the week and my mother took them to her work and she tells me that everyone who she gave it to loved it and told her if I can make them more to take them home with them.

  • A

    I would not sub marshmallow fluff in this recipe. It would be hard to know the exact amount to use in place of the marshmallows, and although this recipe is pretty forgiving, you still need to be fairly careful when making mousse.

  • Danelle, these sound absolutely fabulous. Can’t wait to try them. I was wondering if bottled marshmallow “fluff” would work as a sub for the melted marshmallows. Any experience with it?

4.57 from 76 votes (76 ratings without comment)

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photo of Danelle, author of Let's Dish

Hello! I’m Danelle. Thanks for visiting.

At Let's Dish, I'm bringing a taste of uptown foodie to real-life, everyday meals! Here, I share simple, reliable recipes that make mealtime easy.
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