These Chocolate Mousse Brownies are an indulgent dessert that combines the best of both worlds: rich, fudgy brownies topped with a luscious layer of smooth chocolate mousse and a glossy ganache. This treat is perfect for anyone with a sweet tooth, and it’s sure to impress at any gathering!

Why You’ll Love This Recipe

This dessert brings together three decadent layers: a dense, chocolatey brownie base, airy and creamy mousse, and a rich ganache topping. The brownies are perfectly fudgy, while the mousse provides a light yet creamy contrast. The ganache adds a luxurious finishing touch, making this dessert an irresistible treat for chocolate lovers. Plus, it’s simple to make with only a few steps that yield an impressive result.

Ingredients

For the Brownie Base:
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

For the Chocolate Mousse:
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

For the Ganache Topping:
4 oz (115g) semisweet chocolate, finely chopped
1/2 cup (120ml) heavy cream

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Directions

Step 1: Make the Brownie Base

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line an 8×8-inch (20×20 cm) baking pan with parchment paper.

2. Mix the Wet Ingredients: In a mixing bowl, whisk together the melted butter, granulated sugar, eggs, and vanilla extract until smooth.

3. Add the Dry Ingredients: Sift in the cocoa powder, flour, salt, and baking powder. Gently fold the dry ingredients into the wet ingredients until just combined. Avoid overmixing.

4. Bake the Brownies: Pour the batter into the prepared pan and smooth it out with a spatula. Bake for 20-25 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs. Let the brownies cool completely in the pan.

Step 2: Prepare the Chocolate Mousse

1. Melt the Chocolate: Heat the milk in a small saucepan until just steaming (but not boiling). Pour it over the chopped semisweet chocolate in a heatproof bowl. Let it sit for 2 minutes, then stir until the chocolate is fully melted and smooth. Let it cool until it’s no longer warm but still fluid (about room temperature).

2. Whip the Cream: In a separate bowl, whip the heavy cream with powdered sugar until soft peaks form.

3. Make the Mousse: Gently fold the cooled chocolate mixture into the whipped cream until fully incorporated. Be careful not to deflate the mousse.

4. Assemble: Spread the mousse evenly over the cooled brownie base. Refrigerate for at least 2 hours, or until the mousse is set.

Step 3: Top with Ganache

1. Make the Ganache: Place the chopped chocolate in a heatproof bowl. Heat the heavy cream in a small saucepan until it begins to simmer, then pour it over the chocolate. Let it sit for 2-3 minutes, then stir until smooth and glossy.

2. Pour the Ganache: Pour the ganache over the mousse layer and spread it evenly with an offset spatula.

3. Chill: Refrigerate for another hour, or until the ganache is firm.

Servings and Timing

• Servings: 12-16 servings

• Preparation Time: 30 minutes

• Cook Time: 25 minutes (baking)

• Chill Time: 3-4 hours

Variations

• Add a Nutty Crust: Add chopped walnuts or pecans to the brownie base for an extra crunch.

• Flavored Mousse: Try adding a splash of flavored liqueur (like Baileys or Kahlua) to the mousse for a grown-up twist.

• Fruit Layer: Add a layer of fresh raspberries or strawberries on top of the mousse before adding the ganache for a fruity touch.

Storage/Reheating

• Storage: Store any leftover Chocolate Mousse Brownies in an airtight container in the refrigerator for up to 5 days.

• Reheating: These brownies are best served chilled, but you can bring them to room temperature before serving if desired.

FAQs

How long does the brownie base need to cool before adding the mousse?

Allow the brownie base to cool completely in the pan before spreading the mousse on top to avoid melting the mousse.

Can I use different types of chocolate for the mousse and ganache?

Yes, you can experiment with milk or dark chocolate, but semisweet chocolate provides a balanced flavor in both the mousse and ganache.

Can I make the mousse ahead of time?

Yes, the mousse can be prepared a day in advance and stored in the refrigerator. Just be sure to spread it on the cooled brownies before serving.

What if I don’t have an 8×8-inch pan?

You can use a 9×9-inch pan as a substitute, but the brownies will be slightly thinner, so adjust the baking time accordingly.

How can I tell if the mousse is set?

The mousse should be firm to the touch and hold its shape when you spread it on the brownies.

Can I freeze Chocolate Mousse Brownies?

Yes, you can freeze the brownies for up to 3 months. Just wrap them tightly in plastic wrap and foil before freezing.

Can I make the brownies without the ganache topping?

Yes, the brownies are delicious even without the ganache. You can simply skip that step for a lighter version.

Do I need to use parchment paper in the pan?

Parchment paper makes it easier to remove the brownies from the pan, but if you don’t have it, you can grease and flour the pan.

Can I add a layer of frosting?

If you prefer extra sweetness, you can add a layer of whipped cream or chocolate frosting on top of the ganache.

How do I slice the brownies cleanly?

To slice the brownies cleanly, use a hot knife. Run the knife under hot water, wipe it dry, and then slice through the brownies.

Conclusion

Chocolate Mousse Brownies are a decadent dessert that combines rich, fudgy brownies with a smooth, airy mousse and a luxurious ganache topping. This indulgent treat is perfect for any chocolate lover and will definitely impress your guests. Whether for a special occasion or a sweet snack, these brownies are sure to satisfy your cravings for something truly indulgent!