If you’ve ever dreamed of a dessert that combines the fudgy decadence of brownies with the light, cloud-like magic of peanut butter mousse, then Peanut Butter Mousse Brownies will absolutely make your day. Imagine one thick, chewy chocolate brownie layer topped with a soft, creamy swirl of peanut butter mousse—each bite is a perfect balance of rich cocoa and nutty, velvety sweetness. Whether you’re baking for a celebration, a potluck, or just to treat yourself on an ordinary afternoon, this layered delight is a total crowd-pleaser and a personal favorite that I’m thrilled to share!

Peanut Butter Mousse Brownies Recipe - Recipe Image

Ingredients You’ll Need

Just a handful of kitchen staples stand between you and a pan of irresistible Peanut Butter Mousse Brownies. Each ingredient plays its part, creating layers of flavor and texture—no complicated shopping list required!

Unsalted butter: Gives the brownies a rich, moist crumb and irresistible flavor—always use unsalted so you can control the saltiness!
Granulated sugar: Sweetens the brownie base and helps achieve that classic crackly top.
Large eggs: Bind the ingredients together for structure and a fudgy bite.
Vanilla extract: Enhances both the chocolate and peanut butter with a hint of warmth.
Unsweetened cocoa powder: The key to rich, chocolaty depth in the brownies themselves.
All-purpose flour: Provides the perfect backbone for chewy, not cakey, brownies.
Salt: Just a pinch sharpens the chocolate and peanut butter flavors.
Baking powder: Lightly lifts the brownies so they aren’t too dense.
Heavy whipping cream: The secret to a fluffy, cloud-like peanut butter mousse topping.
Cream cheese (softened): Adds creaminess and a subtle tang to the mousse that balances the sweetness.
Creamy peanut butter: Peanut butter stars in the mousse, so grab your favorite brand for best results.
Powdered sugar: Blends smoothly into the mousse for a sweet, consistent finish.
Vanilla extract (for mousse): Just half a teaspoon rounds out the mousse’s flavor.
Chocolate shavings or chopped peanuts (optional): These make a gorgeous garnish and add a bonus crunch or chocolatey bite on top!

How to Make Peanut Butter Mousse Brownies

Step 1: Prepare the Brownie Batter

Let’s get started by preheating your oven to 350°F and lining an 8×8-inch baking pan with parchment paper for easy brownie removal later. In a medium saucepan, melt the butter over low heat—this will help you achieve an extra fudgy base. Once melted, remove from heat and stir in granulated sugar, eggs, and vanilla. Mixing these until smooth helps develop that chewy texture we all love. Next, add your cocoa powder, flour, salt, and baking powder, mixing just until combined. This is the secret to brownies that are moist, never tough!

Step 2: Bake the Brownies

Pour the batter into your prepared pan and smooth it into the corners. Bake for 20 to 25 minutes—you’re looking for a toothpick to come out with a few moist crumbs, not totally dry. This is what keeps your Peanut Butter Mousse Brownies super fudgy! Set the pan aside to cool completely. Patience pays off here, because if the brownies are warm, the mousse won’t set properly on top.

Step 3: Make the Peanut Butter Mousse

While the brownies are cooling, whip the heavy cream until it forms stiff peaks. This will give your mousse that airy, dreamy lift. In a separate bowl, combine softened cream cheese, creamy peanut butter, powdered sugar, and a dash of vanilla. Blend until it’s smooth and luscious. Finally, gently fold the whipped cream into the peanut butter mixture, being careful not to deflate the fluffiness.

Step 4: Assemble and Chill

Once those brownies are truly at room temperature, spread the peanut butter mousse over the top in a thick, even layer—the contrast in color and texture is almost too pretty to cover! Pop the whole pan in the fridge for at least an hour to allow the mousse to set and intensify all the delicious flavors.

Step 5: Garnish and Serve

Just before serving, go ahead and sprinkle chocolate shavings or chopped peanuts across the top for a professional-looking finish with a hint of crunch. Slice your Peanut Butter Mousse Brownies into generous squares and get ready for smiles all around!

How to Serve Peanut Butter Mousse Brownies

Garnishes

Take your Peanut Butter Mousse Brownies from homemade to bakery-worthy with a few simple garnishes. Chocolate shavings add a touch of elegance and a bittersweet contrast, while chopped peanuts lend crunch and a little extra roasty flavor. You can also drizzle a bit of melted chocolate or even a whisper of caramel sauce across the top if you want to get fancy!

Side Dishes

Since Peanut Butter Mousse Brownies are indulgent and rich, they pair beautifully with fresh fruit—think sliced strawberries or juicy raspberries for a pop of brightness. A scoop of vanilla or coffee ice cream on the side is never a bad idea, or serve with piping-hot coffee or a tall glass of cold milk for the ultimate treat.

Creative Ways to Present

For parties or special occasions, you can cut the brownies into bite-sized cubes and skewer them with toothpicks for a fun dessert platter. Try layering the brownies and mousse in small jars with extra toppings for a cute, portable parfait. Or, use a cookie cutter to make fun shapes—everyone loves a heart- or star-shaped treat!

Make Ahead and Storage

Storing Leftovers

To keep your Peanut Butter Mousse Brownies at their best, store them in an airtight container in the fridge. The mousse layer stays silky and fresh, and the brownies keep their perfect texture for up to 4 days. Simply place a sheet of parchment between layers if you’re stacking them to avoid sticking.

Freezing

These brownies freeze surprisingly well. After chilling until set, cut them into squares, wrap tightly in plastic wrap, and store in a freezer-safe container. They’ll stay delicious for up to 2 months—just thaw overnight in the fridge before serving for a quick and special dessert.

Reheating

If you love your brownies with a slightly softer, just-made mousse, take them out of the fridge and let them sit at room temperature for 10-15 minutes before enjoying. There’s no need to microwave—just a short rest brings out an extra creamy texture.

FAQs

Can I use chunky peanut butter in the mousse?

Chunky peanut butter isn’t recommended for the mousse layer because it can make the texture a bit uneven, but you can always sprinkle chopped peanuts on top for extra crunch!

Do I have to use cream cheese in the mousse?

The cream cheese adds stability and tang to the mousse, but if you need to substitute, mascarpone works really well for a similarly creamy result.

Can I double this recipe for a larger crowd?

Absolutely! Just double every ingredient and bake in a 9×13-inch pan, keeping a close eye on baking time. The Peanut Butter Mousse Brownies will be a hit at any gathering.

Is there a dairy-free alternative for the mousse?

You can swap in a dairy-free cream cheese, coconut whipped cream, and your favorite plant-based milk for a delicious non-dairy take—just make sure everything is well chilled before whipping.

Will boxed brownie mix work as the base?

Yes, if you’re short on time, a boxed brownie mix makes a reliable shortcut. Prepare and bake as directed, let it cool completely, then proceed with the peanut butter mousse topping for effortless Peanut Butter Mousse Brownies.

Final Thoughts

These Peanut Butter Mousse Brownies are one of those desserts that make any occasion feel extra special. Rich, creamy, and just a little bit over-the-top, they’re the ultimate treat for chocolate and peanut butter lovers. Give them a try the next time you want to wow friends or family—you just might discover your new favorite brownie recipe!

Peanut Butter Mousse Brownies Recipe