Rich Double Chocolate Treat

Featured in Decadent Desserts.

These decadent brownies combine a rich fudgy base with a light chocolate mousse topping. While they take time to set, most is hands-off chilling time for the perfect texture.
Sarah
Updated on Tue, 21 Jan 2025 10:32:57 GMT
A close-up of sliced chocolate dessert squares with a creamy layer on top, dusted with cocoa powder, placed on a wooden board and white plates. Pin it
A close-up of sliced chocolate dessert squares with a creamy layer on top, dusted with cocoa powder, placed on a wooden board and white plates. | kitchenscroll.com

I created these Chocolate Mousse Brownies for my daughter's birthday and now they're our family's most requested dessert. Picture this three layers of pure chocolate bliss starting with a rich fudgy brownie base topped with clouds of silky chocolate mousse and finished with a delicate dusting of cocoa powder. It's the kind of dessert that makes everyone's eyes light up when you bring it to the table.

What Makes These Extra Special

These aren't your everyday brownies. The magic happens when that dense fudgy base meets the light as air chocolate mousse on top. Every bite is pure chocolate heaven. I've served these at countless dinner parties and they never fail to steal the show. That moment when you cut into them and reveal those perfect layers gets me every time.

Your Shopping List

The secret to these brownies starts in your grocery cart. I always grab unsalted butter it lets me control the salt in the recipe. Room temperature eggs blend like a dream into the batter. The star of the show is Dutch processed cocoa powder it gives that deep rich chocolate flavor we all crave. For the mousse I splurge on good quality semi sweet chocolate bars. Heavy cream whips up into those perfect clouds of mousse and a little unflavored gelatin helps it hold its shape. Sometimes I swap the chocolate mousse for peanut butter when I'm feeling adventurous.

Let's Bake Together

Start with the brownie layer mix up your butter sugar and vanilla then whisk in those eggs. Add your cocoa powder flour and salt spread it in your pan and into the oven it goes. While that's baking we'll work on the mousse. The trick is blooming the gelatin first then warming it with some cream. Pour this over your chocolate and stir until it's silky smooth. Once everything's cool fold in the whipped cream for that perfect mousse texture. Layer it all together then the hardest part waiting overnight while it sets in the fridge.

A close-up of layered chocolate desserts with a creamy topping, served on a wooden board next to a bottle of milk and striped straws. Pin it
A close-up of layered chocolate desserts with a creamy topping, served on a wooden board next to a bottle of milk and striped straws. | kitchenscroll.com

My Kitchen Secrets

I learned the hard way to always line my pan with parchment paper hanging over the sides it makes getting these beauties out so much easier. Patience is key here make sure everything cools completely between layers. Letting them set overnight in the fridge gives you those picture perfect slices. Cut them small for parties or bigger for those times when only a generous slice will do. And when I'm short on time I'm not above using a good boxed brownie mix for the base.

Keeping Them Fresh

These beauties need to live in the fridge in an airtight container where they'll stay perfect for about 3 days though they rarely last that long in my house. I don't recommend freezing them the mousse just isn't the same afterward. They're best enjoyed straight from the fridge and if you really want to go all out serve them with a scoop of vanilla ice cream or a handful of fresh berries.

Frequently Asked Questions

→ Why do the brownies need to chill so long?
The 6-8 hour chilling time allows the gelatin in the mousse to set properly, ensuring clean cuts and perfect texture when served.
→ Why use Dutch processed cocoa powder?
Dutch processed cocoa powder provides a deeper, richer chocolate flavor and darker color than natural cocoa powder. It's less acidic and more mellow.
→ Can I make these ahead of time?
Yes, these brownies can be made a day ahead. Just wait to dust with cocoa powder until right before serving for the best presentation.
→ Why fold the chocolate into the whipped cream?
Gentle folding preserves the air bubbles in the whipped cream, keeping the mousse light and fluffy. Vigorous stirring would deflate the mixture.
→ Why must the chocolate cool before adding to whipped cream?
Warm chocolate would melt the whipped cream and destroy its structure. Room temperature chocolate maintains the mousse's light, airy texture.

Conclusion

These decadent brownies combine a rich fudgy base with a light chocolate mousse topping. While they take time to set, most is hands-off chilling time for the perfect texture.

Chocolate Mousse Brownies

Two layers of chocolate perfection: a chewy brownie base topped with silky chocolate mousse and dusted with cocoa powder for an elegant finish.

Prep Time
20 Minutes
Cook Time
515 Minutes
Total Time
535 Minutes

Category: Sweet Treats

Difficulty: Difficult

Cuisine: American

Yield: 12 Servings (12 large brownies)

Dietary: Vegetarian

Ingredients

01 1 cup unsalted butter, melted.
02 2¼ cups granulated sugar.
03 1 tablespoon vanilla extract.
04 4 large eggs, room temperature.
05 1¼ cups all-purpose flour.
06 1 cup dutch processed unsweetened cocoa powder.
07 ¾ teaspoon salt.
08 2 tablespoons cold water.
09 2 teaspoons unflavored gelatin.
10 2½ cups heavy cream, divided.
11 4 ounces semi sweet baking bar, finely chopped.
12 ¼ cup powdered sugar.
13 ½ teaspoon vanilla extract.
14 1 tablespoon dutch processed cocoa powder for dusting.

Instructions

Step 01

Preheat oven to 350°F. Line 9x13 pan with parchment, leaving overhang. Spray sides.

Step 02

Mix melted butter and sugar until dissolved. Add vanilla and eggs one at a time. Fold in cocoa, flour, and salt.

Step 03

Spread batter in pan. Bake 30-35 minutes until toothpick comes out clean. Cool completely.

Step 04

Bloom gelatin in cold water. Heat ½ cup cream, dissolve gelatin in it. Pour over chopped chocolate, let melt. Cool to room temperature.

Step 05

Whip remaining cream with powdered sugar and vanilla to stiff peaks. Gently fold in cooled chocolate mixture in thirds.

Step 06

Spread mousse over cooled brownies. Cover and refrigerate 6-8 hours or overnight.

Notes

  1. Allow mousse to set completely for clean cuts.
  2. Can be made day ahead.
  3. Dust with cocoa powder just before serving.

Tools You'll Need

  • 9x13 baking pan.
  • Electric mixer.
  • Offset spatula.
  • Parchment paper.

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Dairy.
  • Eggs.
  • Wheat.

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 550
  • Total Fat: 32 g
  • Total Carbohydrate: 65 g
  • Protein: 8 g