Name: Chocolate Mousse Brownies Recipe
Prep time: 20 min
Cook time: 35 min
Total time: 2 h 55 min
Cuisine: American
Ingredients: 1 ½ cups (187.5 g) all-purpose flour; 1 tablespoon cornstarch; ⅓ cup (39 g) Dutch-processed cocoa powder; ½ teaspoon baking powder; ¼ teaspoon kosher salt; 4 large eggs, room temperature; 2 cups (400 g) granulated sugar; ¾ cup (1 ½ sticks / 170 g) unsalted butter; 2 teaspoons vanilla extract; 1 ½ cups (357 g) heavy whipping cream, cold, divided; 1 cup chocolate chips, semi-sweet (or your preference); chocolate curls, for garnish (optional)

Jump to Recipe· 3.8 from 4 reviews

If you’re craving a dessert that combines rich, fudgy texture with airy, creamy delight, this Chocolate Mousse Brownies Recipe is exactly what you need. Imagine biting into a decadent brownie base topped with luscious, velvety chocolate mousse that melts in your mouth with every forkful. It’s the perfect harmony of bold chocolate flavor and light sweetness, making it a standout treat for any occasion. Whether you’re serving it at a dinner party or just indulging in a quiet moment of sweetness, these brownies will quickly become a favorite in your recipe collection.

Ingredients You’ll Need

A wooden bowl filled with a smooth, light brown chocolate batter that has a creamy texture. A pink silicone spatula is resting in the bowl, covered partly with the batter. The bowl is set on a white marbled surface next to a beige and orange checkered cloth, with three small nested bowls in green, dark brown, and gray colors visible beside it. The scene is softly lit with natural light coming from the side, giving the batter a slight gloss. Photo taken with an iphone --ar 4:5 --v 7

Gathering your ingredients for this Chocolate Mousse Brownies Recipe is a simple yet rewarding step. Each component is thoughtfully chosen to contribute to the final texture and flavor—from the cocoa powder that gives a deep chocolate punch to the heavy cream that creates that dreamy mousse topping.

1 ½ cups all-purpose flour: Provides structure to the brownie base, ensuring a perfect chewy bite.
1 tablespoon cornstarch: Keeps the brownies tender and soft by lightening the flour’s density.
⅓ cup Dutch-processed cocoa powder: Adds intense chocolate flavor and a beautiful dark color.
½ teaspoon baking powder: Helps the brownies rise just enough for a lovely texture.
¼ teaspoon kosher salt: Enhances the overall flavor and balances sweetness.
4 large eggs, room temperature: Offers richness and binds the batter together.
2 cups granulated sugar: Sweetens the brownies perfectly without overpowering the chocolate.
¾ cup unsalted butter: Adds moisture and a buttery flavor to the brownie base.
2 teaspoons vanilla extract: Rounds out the chocolate with a warm, aromatic note.
1 ½ cups heavy whipping cream, cold: Essential for whipping into the light and fluffy mousse topping.
1 cup semi-sweet chocolate chips: Melts into the cream to form that irresistible mousse layer.
Chocolate curls (optional): Perfect for garnish to give your brownies an elegant finish.

How to Make Chocolate Mousse Brownies Recipe

Step 1: Prepare the Brownie Layer

Start by preheating your oven to 350°F and lining a 9×13-inch baking dish with parchment paper for easy brownie removal. In a large bowl, whisk together the flour, cornstarch, cocoa powder, baking powder, and salt to combine all the dry ingredients evenly.

Step 2: Mix the Wet Ingredients

Using a stand mixer fitted with the paddle attachment, beat the eggs, granulated sugar, unsalted butter, and vanilla extract on medium speed until the mixture becomes light and fluffy. This step is crucial as it introduces air that will give your brownies a tender crumb.

Step 3: Combine Dry and Wet Ingredients

With the mixer turned off, add the dry flour mixture to the wet ingredients. Then mix on low speed just until everything is well incorporated. Avoid overmixing to keep the brownies delightfully fudgy.

Step 4: Bake the Brownies

Pour the batter into your prepared baking dish, smoothing out the top. Bake for 30 to 35 minutes. You’ll know the brownies are perfectly done when the edges look set but the center still shines with a bit of moisture. Let them cool completely at room temperature before moving on to the mousse.

Step 5: Make the Chocolate Mousse Layer

Heat ½ cup of heavy cream in a microwave-safe bowl for about 50 seconds until hot but not boiling. Stir in the chocolate chips until fully melted and smooth. Allow this mixture to cool. Meanwhile, whip the remaining 1 cup of heavy cream to stiff peaks using a mixer. Gently fold the cooled chocolate mixture into the whipped cream until just combined—this will create your luscious mousse topping.

Step 6: Assemble and Chill

Spread the chocolate mousse evenly over the cooled brownies. If desired, sprinkle chocolate curls on top for a beautiful presentation. Refrigerate the brownies for at least 2 hours or overnight to let the mousse set perfectly.

How to Serve Chocolate Mousse Brownies Recipe

A rectangular chocolate dessert is shown in a white ceramic baking dish with handles, placed on a white marbled surface. The dessert has two visible layers: the bottom layer is a rich dark chocolate cake with a soft texture, and the top layer is a thick, smooth chocolate frosting spread evenly but with slight swirls and peaks along the edges. The frosting is topped generously with small, curly chocolate shavings scattered all over, creating a textured look. photo taken with an iphone --ar 4:5 --v 7

Garnishes

While chocolate curls provide a stunning finish, feel free to sprinkle a touch of cocoa powder, a dusting of powdered sugar, or even a few fresh raspberries atop the mousse layer. These small additions elevate both the look and taste, making every bite even more special.

Side Dishes

Serve these brownies with a scoop of vanilla ice cream or a dollop of freshly whipped cream to complement the richness. Fresh berries or a drizzle of salted caramel sauce also pair beautifully, balancing the deep chocolate flavors.

Creative Ways to Present

For celebrations, cut the brownies into elegant squares and serve on a decorative platter. You can add a mint leaf or edible gold flakes for a touch of class. Alternatively, serve individual portions in small glass cups with layered mousse and brownie pieces for a fancy dessert parfait experience.

Make Ahead and Storage

Storing Leftovers

Keep any leftover chocolate mousse brownies covered tightly in an airtight container in the refrigerator. They will stay fresh and delicious for up to four days, making them a great make-ahead dessert option.

Freezing

To freeze, wrap the brownies securely in plastic wrap and place them in a freezer-safe container or bag. They can be frozen for up to two months. Thaw in the refrigerator overnight before serving for best texture.

Reheating

Because of the mousse topping, it’s best to enjoy these brownies chilled. If you prefer them slightly softer, allow them to sit at room temperature for 10 to 15 minutes before eating, but avoid microwaving as it might ruin the mousse texture.

FAQs

Can I use milk chocolate instead of semi-sweet chocolate chips?

Absolutely! Milk chocolate will make the mousse sweeter and creamier, but it might be less intense in chocolate flavor. Adjust sweetness by reducing sugar slightly in the brownie layer if you prefer a more balanced dessert.

Is it possible to make these brownies gluten-free?

Yes, you can substitute the all-purpose flour with a 1-to-1 gluten-free baking flour blend. Make sure it contains xanthan gum for structure, and the results will be just as delicious.

How long should I chill the mousse layer for optimal texture?

Refrigerating the mousse-topped brownies for at least 2 hours is ideal to let the mousse firm up nicely. Overnight chilling enhances the flavors even more, resulting in a creamier and more refined texture.

Can I prepare the mousse ahead of time separately?

You can make the mousse up to one day in advance and keep it covered in the refrigerator. Gently fold it again before spreading over the brownies to restore some lightness.

What’s the secret to fudgy brownies in this recipe?

The key is the perfect balance of butter, sugar, and careful baking time that leaves the center moist while the edges set. Avoid overbaking and test with a toothpick; it should come out with a few moist crumbs for fudgy brownies.

Final Thoughts

This Chocolate Mousse Brownies Recipe is a true crowd-pleaser that brings together the best of both worlds—rich brownies and silky mousse. It’s a dessert that’s as fun to make as it is to eat, perfect for special occasions or anytime you want to spoil yourself or loved ones. I can’t wait for you to try it and make it your own beloved classic!