Name: Chocolate Mousse Brownies Recipe
Prep time: 30 min
Cook time: 25 min
Total time: 3 h 30 min
Cuisine: American
Ingredients: 1/2 cup (115g) unsalted butter, melted; 1 cup (200g) granulated sugar; 2 large eggs; 1 tsp vanilla extract; 1/3 cup (40g) unsweetened cocoa powder; 1/2 cup (65g) all-purpose flour; 1/4 tsp salt; 1/4 tsp baking powder; 1 1/2 cups (350ml) heavy whipping cream, chilled; 8 oz (225g) semisweet chocolate, finely chopped; 3 tbsp (45ml) milk; 2 tbsp (25g) powdered sugar; 4 oz (115g) semisweet chocolate, finely chopped; 1/2 cup (120ml) heavy cream

Jump to Recipe·5.2 from 10 reviews

Sink your fork into the ultimate dessert indulgence with this Chocolate Mousse Brownies Recipe. Imagine three luscious layers: a fudgy chocolate brownie foundation, a pillowy cloud of chocolate mousse, and a glossy layer of rich ganache. Each bite is creamy, decadent, and impossible to resist. Whether you’re treating yourself after a long day or planning a special gathering, this recipe delivers impressive results every time. You’ll adore how each component comes together, creating a showstopping sweet that’s pure chocolate bliss!

Chocolate Mousse Brownies Recipe - Recipe Image

Ingredients You’ll Need

Gathering just the right ingredients is truly the secret to unforgettable desserts! For this Chocolate Mousse Brownies Recipe, every element—basic as it may seem—is essential for building the irresistible flavor, texture, and beautiful layers that set this treat apart.

Unsalted Butter (1/2 cup, melted): Creates an irresistibly moist and fudgy base for your brownies, infusing each bite with rich flavor.
Granulated Sugar (1 cup): Balances the bittersweet chocolate notes and gives the brownies a delicate, perfectly sweet finish.
Eggs (2 large): Add structure and richness, binding together all the wonderful ingredients in your brownie base.
Vanilla Extract (1 tsp): Enhances and deepens chocolate flavors, adding a lovely aromatic quality.
Unsweetened Cocoa Powder (1/3 cup): Provides an intense chocolate flavor and deep color, forming the heart of the brownie layer.
All-Purpose Flour (1/2 cup): Gives the brownie layer its tender, delectable crumb while keeping it fudgy instead of cakey.
Salt (1/4 tsp): Pops the chocolate flavor and keeps the sweetness balanced; don’t skip it!
Baking Powder (1/4 tsp): Just a touch to give the brownie the perfect texture and a little lift.
Heavy Whipping Cream (1 1/2 cups, chilled): Whips up fluffy and light, making the chocolate mousse irresistibly airy.
Semisweet Chocolate (8 oz for mousse & 4 oz for ganache, finely chopped): The star ingredient that brings deep, sophisticated chocolate notes to both mousse and ganache layers.
Milk (3 tbsp): Helps melt the chocolate for the mousse seamlessly, ensuring it’s smooth and creamy.
Powdered Sugar (2 tbsp): Lightly sweetens and stabilizes the mousse layer for a dreamy texture.
Heavy Cream (1/2 cup for ganache): When poured over semisweet chocolate, it creates the luxurious, shiny ganache topping.

How to Make Chocolate Mousse Brownies Recipe

Step 1: Prepare the Brownie Base

Start by preheating your oven to 350°F (175°C), then line an 8×8-inch baking pan with parchment paper for easy removal. In a mixing bowl, whisk together the melted unsalted butter, granulated sugar, eggs, and vanilla extract until the mixture looks glossy and smooth. Sift in your cocoa powder, flour, salt, and baking powder, gently folding the dry ingredients into the wet until just combined—overmixing means cakey brownies, and we want dense and fudgy! Pour the batter into the pan and spread it evenly. Bake for 20 to 25 minutes, until a toothpick comes out with just a few moist crumbs. Let the brownie cool completely in the pan, resisting the urge to dive in too soon!

Step 2: Create the Chocolate Mousse Layer

While your brownie base is cooling, it’s time to work on that dreamy chocolate mousse. Heat the milk gently until just steaming, then pour it over finely chopped semisweet chocolate. Let this sit and melt together, then stir until perfectly smooth. Allow it to cool to room temperature—but still fluid—so your mousse is airy and luscious. In a separate chilled bowl, whip that heavy cream and powdered sugar to soft peaks. Now, gently fold the cooled chocolate mixture into your whipped cream (tip: start by folding in just a tablespoon or two of cream to stabilize the chocolate). This keeps the mousse light and fluffy. Spread this chocolatey cloud evenly over your brownie base and refrigerate for at least 2 hours, until set.

Step 3: Finish With Ganache

This luxurious chocolate ganache is the crowning jewel of your Chocolate Mousse Brownies Recipe. Place your chopped chocolate in a heatproof bowl and heat the heavy cream until it just begins to simmer. Pour the hot cream over the chocolate and let it sit undisturbed for a few minutes so the chocolate softens, then stir to glossy perfection. Smooth the ganache over the mousse layer and refrigerate for another hour, just until the topping is firm to the touch. The hardest part? Waiting while these layers meld together!

How to Serve Chocolate Mousse Brownies Recipe

Garnishes

A showstopper like this deserves an equally pretty finish! A dusting of cocoa powder or a scattering of chocolate curls adds elegance with minimal effort. If you’re feeling extra, try a dollop of whipped cream, a few fresh berries, or a sprig of mint. They not only brighten the plate but also play beautifully against the deep, rich chocolate notes.

Side Dishes

Since the Chocolate Mousse Brownies Recipe is ultra-decadent and rich, pair it with something light and refreshing to balance the experience. Fresh strawberries, raspberries, or sliced kiwi are lovely alongside, as their tartness cuts through the chocolate. For a special occasion, serve with a scoop of vanilla bean ice cream or a shot of espresso for the ultimate treat.

Creative Ways to Present

Turn this classic treat into an eye-catching dessert bar by cutting the brownies into neat squares and serving them on a tiered stand. For parties, you can even make mini brownie bites with piped mousse and a glossy ganache drop. Or go for an elegant plated dessert by adding a drizzle of raspberry coulis and a sprinkle of flaky sea salt on the side. However you serve it, this Chocolate Mousse Brownies Recipe earns all the “oohs” and “ahhs.”

Make Ahead and Storage

Storing Leftovers

To keep your brownies at their best, store any leftovers in an airtight container in the fridge. The mousse and ganache both hold up beautifully for up to four days, staying creamy and rich. Just remember to use parchment or wax paper between layers if you need to stack them, keeping each bite as gorgeous as the first.

Freezing

Yes, you can freeze this Chocolate Mousse Brownies Recipe! Slice the brownies into individual portions, wrap each one well in plastic wrap, then pop them into a freezer-safe bag or container. They’ll remain delicious for up to two months. For best results, thaw in the fridge overnight before serving, so the mousse and ganache retain their smooth, dreamy texture.

Reheating

These brownies really shine when served chilled, but if you’d like a slightly softer texture, let a piece sit at room temperature for about 20 minutes before eating. Avoid microwaving, as it can melt the mousse and ganache layers, changing their luxurious consistency.

FAQs

Can I use milk chocolate instead of semisweet?

Absolutely! If you prefer a sweeter, creamier flavor, swap out the semisweet chocolate for milk chocolate in both the mousse and ganache. Just keep in mind that the treat will be noticeably sweeter, so you might want to slightly reduce the added sugar in the recipe.

How do I know when the brownie base is done?

Look for the edges to be set and a toothpick inserted into the center to come out with a few moist (but not wet) crumbs. Overbaking will make the base dry instead of fudgy, so start checking at the 20-minute mark.

Is it necessary to refrigerate between each step?

Yes, refrigerating after the mousse and again after adding the ganache sets each layer, making slicing neater and maintaining those beautiful, distinct layers. Skipping this step can lead to the layers blending together or becoming too soft.

Can I double this Chocolate Mousse Brownies Recipe for a crowd?

Definitely! Double all the ingredients and use a 9×13-inch pan. Just be sure to adjust the baking time for the thicker base—start checking at 28 minutes for doneness. The result is a big batch perfect for parties or potlucks.

Are there any gluten-free options for this recipe?

Yes! Swap the all-purpose flour with your favorite 1-to-1 gluten-free blend. The rest of the ingredients are naturally gluten-free, so your Chocolate Mousse Brownies Recipe will still be perfectly fudgy and delicious.

Final Thoughts

If you’re ready for a dessert that looks and tastes like it came from a pâtisserie, this Chocolate Mousse Brownies Recipe is for you. With simple steps and breathtaking results, it’s the kind of treat that makes any day feel special. Gather your ingredients and give it a try—your inner chocolate lover will thank you!