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)

Chocolate Mousse Brownies are a show-stopper dessert that bring together the rich, fudgy depth of classic brownies with the silky cloud of chocolate mousse, all crowned with a flourish of chocolate curls. This luscious treat is where two chocolatey favorites meet in harmony, creating an irresistible indulgence that’s as gorgeous as it is delicious. Whether you’re baking for a celebration, family gathering, or just to spoil yourself, Chocolate Mousse Brownies always impress with their layers of deep cocoa flavor, creamy mousse topping, and that perfect hint of elegance in every bite.

Ingredients You’ll Need

Chocolate Mousse Brownies Recipe - Recipe Image

Ingredients You’ll Need

The beauty of Chocolate Mousse Brownies starts with quality, everyday ingredients. Each component is chosen for its ability to build flavor, texture, and those mouthwatering layers. A good cocoa powder, fresh eggs, and heavy cream all help make this dish downright dreamy.

1 ½ cups (187.5 g) all-purpose flour: The sturdy backbone that gives the brownies structure without making them overly dense.
1 tablespoon cornstarch: A secret to extra soft, tender brownies with a bit of chew.
⅓ cup (39 g) Dutch-processed cocoa powder: Deepens the chocolate flavor and lends a luxurious, dark color to the base.
½ teaspoon baking powder: Just enough lift to keep the brownies from being too heavy.
¼ teaspoon kosher salt: Enhances every chocolatey note and balances the sweetness.
4 large eggs, room temperature: Essential for binding and creating that perfect chewy-fudgy texture.
2 cups (400 g) granulated sugar: Sweetens and helps keep the brownies moist.
¾ cup (1 ½ sticks / 170 g) unsalted butter: Richness central; ensures a deep, melt-in-your-mouth finish.
2 teaspoons vanilla extract: Rounds out the chocolate profile with warmth and complexity.
1 ½ cups (357 g) heavy whipping cream, cold, divided: The secret to a dreamy mousse layer; cold cream whips up fluffy every time.
1 cup chocolate chips, semi-sweet (or your preference): Choose a chocolate you love—the mousse depends on it for flavor!
Chocolate curls, for garnish (optional): This little flourish is optional but makes the finished brownies look, and taste, extra special.

How to Make Chocolate Mousse Brownies

Step 1: Prep Your Baking Pan

Begin by preheating your oven to 350°F and lining a 9×13-inch baking dish with parchment paper. Leave some extra parchment hanging over the sides so you can lift out the brownies like a pro—no sticking or crumbling. This step is especially helpful when you’re eager to slice your Chocolate Mousse Brownies cleanly for guests (or yourself!).

Step 2: Mix the Dry Brownie Ingredients

Grab a large bowl and combine your flour, cornstarch, Dutch-processed cocoa powder, baking powder, and kosher salt. Whisk everything together until it’s evenly blended and free of any pesky lumps—the cornstarch in this mix is what gives these brownies their extra velvety bite.

Step 3: Create the Brownie Batter

In the bowl of your stand mixer, add the eggs, granulated sugar, unsalted butter, and vanilla extract. Beat these together on medium speed until the mixture is lightened in color and fluffy; this is the secret to getting that glossy, crackly brownie top! With the mixer off, add your dry ingredients, then mix on low until integrated into a thick, chocolatey batter you’ll want to eat straight from the bowl.

Step 4: Bake the Brownie Base

Spread the brownie batter evenly into your prepared pan, making sure it reaches all corners. Pop it in the oven and bake for 30 to 35 minutes. You’re aiming for set edges and a shiny, just-moist center. Remember: slightly underbaking keeps them fudgy, which is essential for the ultimate Chocolate Mousse Brownies experience. Let the brownies cool completely—you don’t want to melt the mousse layer!

Step 5: Prepare the Chocolate Mousse

Pour ½ cup of cold heavy cream into a microwave-safe bowl and heat for about 50 seconds. Add your chocolate chips, letting the warm cream melt them. Stir until smooth and glossy; this mixture will cool quickly. Next, take the remaining 1 cup of heavy cream and whip it until stiff peaks form—this part is all about patience and soft clouds. Gently fold the cooled chocolate mixture into the whipped cream, keeping as much airy fluff as possible.

Step 6: Layer and Chill

Once your brownies are fully cooled, spread the chocolate mousse evenly over the surface. Use an offset spatula for a smooth finish, and go ahead—be generous! If you love a little drama, sprinkle chocolate curls on top. Now, cover and refrigerate your Chocolate Mousse Brownies for at least 2 hours (overnight is even better) before slicing into perfect, decadent squares.

How to Serve Chocolate Mousse Brownies

Garnishes

Nothing beats the contrast of delicate chocolate curls on top of the fluffy mousse, but feel free to get playful! A dusting of cocoa powder, sprinkles of roasted nuts, or even a few fresh raspberries can make your tray of Chocolate Mousse Brownies look like something straight from a patisserie.

Side Dishes

These brownies are incredibly rich, so pair them with something light if you like—a scoop of vanilla ice cream is classic, or a dollop of whipped cream brings cool balance. For a fresh contrast, a handful of seasonal berries or a tangy fruit sauce is lovely alongside each serving.

Creative Ways to Present

Try cutting your Chocolate Mousse Brownies into small squares for the prettiest dessert platter, or serve them in individual parfait glasses, layered with extra mousse and berries for a dramatic effect. For parties, insert lollipop sticks before chilling for adorable, mousse-topped brownie pops kids (and adults) will adore.

Make Ahead and Storage

Storing Leftovers

Cover any leftover Chocolate Mousse Brownies tightly with plastic wrap or store them in an airtight container in the refrigerator. They’ll stay moist and fabulous for up to four days, and sometimes they’re even better on day two when the flavors have had a chance to mingle!

Freezing

To freeze, wrap each brownie square in plastic and then foil to prevent freezer burn. Pop them in a freezer-safe container and store for up to two months. When you’re ready for a treat, defrost brownies in the fridge overnight for best texture.

Reheating

Since these brownies have a mousse layer, skip the microwave. Instead, allow cold brownies to rest at room temperature for 15-20 minutes before eating. This brings out the richness of both the brownie and the mousse, and makes every bite as luscious as the first.

FAQs

Can I use a different kind of chocolate for the mousse?

Absolutely! Semi-sweet chocolate keeps the mousse balanced, but feel free to use milk chocolate for a sweeter touch or dark chocolate for bold intensity. Just be sure to use chips or a bar you enjoy snacking on, since their flavor really shines through.

Do I really need to chill the brownies before serving?

Yes, chilling is key for that beautiful mousse layer to set perfectly atop the brownies. It also ensures clean, picture-perfect slices. Two hours is the minimum, but overnight makes them even more delightful!

Can I make these brownies gluten-free?

Yes! Swap the all-purpose flour for your favorite 1:1 gluten-free baking blend. Brownies are one of the easiest desserts to make gluten-free without sacrificing flavor or texture, so no one will notice the difference.

How do I know when the brownie base is done baking?

Look for edges that are set and centers that are shiny but not jiggly. If you like them fudgy, a toothpick should come out with a few moist crumbs. Overbaking will dry them out, so trust your eyes more than the clock.

Can I double the recipe for a crowd?

You can! Use two 9×13 pans or one larger sheet pan if your oven allows. The baking time may vary slightly, so check for doneness as described above. These Chocolate Mousse Brownies are always a hit at parties and celebrations.

Final Thoughts

If you’re searching for a dessert that makes everyone swoon, Chocolate Mousse Brownies are your new best friend. Say yes to that dreamy mousse and the fudgiest brownie base—you deserve it! Give this recipe a try and prepare for rave reviews from every chocolate lover lucky enough to snag a square.