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Chocolate Mousse Brownies

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If there is one thing Max and I agree on, it is that there is no such thing as "too much chocolate." These Chocolate Mousse Brownies are our latest obsession—a dense, fudgy brownie base topped with a thick layer of airy, silky chocolate mousse and a glossy ganache finish. It is basically three desserts in one, and watching Max try to decide whether to lick the mousse off first or bite straight through is the best part of baking day.

These indulgent Chocolate Mousse Brownies feature a dense, chewy fudge brownie base topped with a thick layer of light, airy chocolate mousse and a silky ganache finish. A stunning triple-layer dessert.
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Chocolate mousse brownies with three rich layers—fudgy brownie base, creamy chocolate mousse center, and glossy chocolate ganache topped with chocolate shavings.
Chocolate mousse brownies with three rich layers—fudgy brownie base, creamy chocolate mousse center, and glossy chocolate ganache topped with chocolate shavings. Save it For Later
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Why You Will Love This Chocolate Mousse Brownies

You will love this recipe because it masters the art of texture contrast. The bottom layer is chewy and rich, while the top layer is light as a cloud and melts in your mouth immediately. It looks like a fancy French patisserie creation with those clean, distinct layers, but the mousse is deceptively easy to whip up. It’s the perfect make-ahead dessert because it actually gets better after chilling in the fridge for a few hours.

How To Make Chocolate Mousse Brownies

We start by baking a classic fudge brownie base—no cakey brownies allowed here! While that cools completely (this is the hard part, waiting!), we whip up a luscious mousse using melted chocolate and heavy cream. We spread the thick mousse over the cooled brownies and let it set. To match the bakery look, we finish it off with a thin layer of chocolate ganache and shavings before chilling it to slice perfection.

Chocolate Mousse Brownies Ingredients

The Fudgy Brownie Base

  • ½ cup unsalted butter; melted
  • 1 cup granulated sugar
  • 2 large eggs; room temperature
  • 1 teaspoon vanilla extract
  • ⅓ cup unsweetened cocoa powder (Dutch-process works best)
  • ½ cup all-purpose flour
  • ¼ teaspoon salt

The Chocolate Mousse Layer

  • 1 ½ cups heavy whipping cream; cold
  • 1 cup semi-sweet chocolate chips (or chopped bar)
  • ¼ cup powdered sugar
  • 1 teaspoon gelatin powder (dissolved in 1 tablespoon water) optional for firmer cuts
  • ½ teaspoon vanilla extract

The Ganache & Garnish

  • ½ cup semi-sweet chocolate chips
  • ¼ cup heavy cream (hot)
  • Chocolate shavings (for topping)
Ingredients for Chocolate Mousse Brownies arranged in a 4-panel flat lay on a white marble kitchen counter. Save it For Later

Step by Step Method

Bake the Brownies

  • Preheat your oven to 350°F (175°C) and line an 8x8 inch baking pan with parchment paper, leaving an overhang for lifting.
  • Whisk the melted butter and sugar vigorously until smooth. Beat in the eggs and vanilla.
  • Stir in the cocoa powder, flour, and salt until just combined.
  • Pour into the pan and bake for 20–25 minutes. Let them cool completely in the pan.

Prep the Mousse Base

  • Melt the chocolate chips in the microwave in 30-second intervals until smooth. Let it cool to room temperature (if it's hot, it will melt the cream).
  • Mom Tip: If using gelatin for sturdier slices, dissolve it in water, microwave for 10 seconds to melt, and whisk into the cooled chocolate.

Whip the Cream

  • In a chilled bowl, beat the heavy cream, powdered sugar, and vanilla until stiff peaks form.
  • Gently fold the cooled melted chocolate into the whipped cream until no white streaks remain.

Assemble and Chill

  • Spread the mousse evenly over the completely cooled brownie layer using an offset spatula to get it flat.
  • Refrigerate for 30 minutes while you make the ganache.

The Ganache Top

  • Pour hot heavy cream over the chocolate chips; let sit for 5 minutes, then whisk until smooth.
  • Pour over the chilled mousse layer and tilt the pan to coat evenly.
  • Top with chocolate shavings.
  • Refrigerate for at least 3–4 hours (or overnight) to set fully.
Chocolate mousse brownies with layered brownie base, creamy chocolate mousse, and glossy ganache topping, garnished with chocolate shavings. Save it For Later

MAX’S REACTION

"The top part feels like eating a chocolate cloud! I like squishing the fluffy part against the roof of my mouth. Can I have the corner piece with the most chocolate on top?"

What Pairs Well With Chocolate Mousse Brownies

Since this dessert is incredibly rich, we love serving it with fresh berries—raspberries or strawberries are perfect because their tartness cuts through the chocolate. A hot cup of espresso or a glass of cold milk is also essential to balance the sweetness.

Chocolate Mousse Brownies Variations

Mint Chocolate

Add ½ teaspoon of peppermint extract to the mousse mixture and garnish with crushed candy canes or Andes mints. It tastes just like a thin mint cookie in brownie form.

Peanut Butter Swirl

Before adding the mousse, spread a thin layer of creamy peanut butter over the brownie base. Top with the chocolate mousse for a buckeye-inspired treat.

Salted Caramel

Drizzle salted caramel sauce over the brownie layer before adding the mousse. Sprinkle flaky sea salt on top of the finished ganache for a sweet and salty crunch.

Mocha Mousse

Dissolve a teaspoon of instant espresso powder into the melted chocolate for the mousse. The coffee flavor intensifies the chocolate and makes it feel more "adult."

Chocolate mousse brownies with a fudgy brownie base, creamy chocolate mousse layer, and glossy chocolate topping, sliced and ready to serve. Save it For Later

Equipment

  • 8x8 inch baking pan
  • Electric hand mixer or stand mixer
  • Mixing bowls
  • Parchment paper
  • Offset spatula
  • Sharp knife (for slicing)
  • Mom Tip: Run your knife under hot water and wipe it dry between every single cut to get those perfect, clean layers shown in bakery photos.

Storage / Make Ahead / Serving Tips

Refrigerator Storage

Because of the heavy cream in the mousse, these must be kept in the fridge. Store them in an airtight container for up to 4 days.

Freezing

These freeze surprisingly well! Wrap cut squares individually in plastic wrap and foil. Thaw them in the fridge overnight before eating. The mousse texture might change slightly but is still delicious.

Make Ahead

This is the ultimate make-ahead dessert. I actually think they taste better on day two when the mousse has perfectly set and melded with the brownie.

Top Tips for Best Chocolate Mousse Brownies

The most critical step is patience: the brownies must be 100% cool before you add the mousse. If the brownie is even slightly warm, the mousse will melt into a soup. Also, when folding the chocolate into the cream, take your time. If you mix too aggressively, you will deflate the air bubbles and lose that fluffy "mousse" texture. For clean slices, dip your knife in hot water and wipe it clean after every cut.

Chocolate Mousse Brownies FAQs

Can I use a box mix for the brownies?

Absolutely! Easy chocolate mousse brownies can start with your favorite box mix. Just bake it in an 8x8 pan and let it cool fully.

Do I really need the gelatin?

No, you don't need it. The mousse will set without it, but it will be softer. If you want really sharp, clean cuts like a bakery, the gelatin helps stabilize the whipped cream.

Why is my mousse grainy?

This usually happens if the melted chocolate was too hot when added to the cold cream, causing the chocolate to seize. Make sure the chocolate is cool to the touch.

Can I make these gluten-free?

Yes, just swap the all-purpose flour in the brownie base for a 1:1 gluten-free flour blend. The mousse and ganache layers are naturally gluten-free.

A Double Dose of Chocolate

This recipe has become our secret weapon for birthdays and potlucks because everyone thinks we spent hours in the kitchen. We hope you enjoy these decadent squares as much as we do. If you have a serious sweet tooth, you absolutely must try our Brown Sugar Pop Tart Cookies, bake some fluffy Chocolate Chip Vanilla Custard Brioches for brunch, or whip up the Best Red Velvet Cupcakes for a party treat.

Share your Chocolate Mousse Brownies! Tag us @HannahCooking with #ChocolateMousseBrownies; we’re dying to see your version and hear about your homemade kitchen stories!

⭐️ Rate this Chocolate Mousse Brownies recipe and let us know what twists or ingredients you used!

Looking for other recipes like Chocolate Mousse Brownies? Try these:

Chocolate mousse brownies with three rich layers—fudgy brownie base, creamy chocolate mousse center, and glossy chocolate ganache topped with chocolate shavings. Save it For Later

Chocolate Mousse Brownies

These indulgent Chocolate Mousse Brownies feature a dense, chewy fudge brownie base topped with a thick layer of light, airy chocolate mousse and a silky ganache finish. A stunning triple-layer dessert.
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Course: Dessert
Cuisine: American
Prep Time: 30 minutes
Cook Time: 25 minutes
Total Time: 3 hours 55 minutes
Servings: 9 g
Calories: 420kcal
Cost: $12

Equipment

  • 1 Baking pan (8x8 inch)
  • 1 Electric mixer (Hand or stand)
  • 3 Mixing bowls (Medium)
  • 1 Offset spatula (For smooth layers)

Ingredients

  • ½ cup unsalted butter - Melted
  • 1 cup granulated sugar - For brownie
  • 2 large eggs - Room temperature
  • 1 teaspoon vanilla extract - Divided use
  • ⅓ cup unsweetened cocoa powder - Dutch process
  • ½ cup all-purpose flour - Sifted
  • ¼ teaspoon salt - Balances flavor
  • 1 ½ cups heavy whipping cream - Cold, for mousse
  • 1 cup semi-sweet chocolate chips - Melted and cooled for mousse
  • ¼ cup powdered sugar - For mousse
  • ½ cup chocolate chips - For ganache
  • ¼ cup heavy cream - Hot, for ganache
  • 2 tablespoon chocolate shavings - Garnish

Instructions 

  • Preheat oven to 350°F and line an 8x8 inch pan with parchment paper.
  • Whisk melted butter, sugar, eggs, and vanilla; stir in cocoa, flour, and salt.
  • Bake for 20–25 minutes; let cool completely in the pan.
  • Whip heavy cream and powdered sugar to stiff peaks; fold in cooled melted chocolate.
  • Spread mousse over cooled brownies and refrigerate for 30 minutes.
  • Pour hot cream over chocolate to make ganache; spread over mousse and chill for 3 hours.
  • Top with chocolate shavings, slice with a hot knife, and serve.

Notes

Ensure the brownie base is completely cool before adding the mousse layer to prevent melting. Use a hot knife to slice for clean, bakery-style edges.

Nutrition

Serving: 120g | Calories: 420kcal (21%) | Carbohydrates: 40g (13%) | Protein: 5g (10%) | Fat: 29g (45%) | Saturated Fat: 18g (113%) | Polyunsaturated Fat: 1g | Monounsaturated Fat: 8g | Cholesterol: 105mg (35%) | Sodium: 90mg (4%) | Potassium: 200mg (6%) | Fiber: 3g (13%) | Sugar: 32g (36%) | Vitamin A: 650IU (13%) | Calcium: 45mg (5%) | Iron: 1.5mg (8%)

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