Fudgy Peanut Butter Whiskey Brownies with Buttercream

Treat yourself to fudgy brownies with a fluffy peanut butter whiskey buttercream for the ultimate decadent dessert.

If there’s one dessert that always disappears first at a gathering, it’s a pan of rich, fudgy brownies. But these Fudgy Whiskey Brownies with Peanut Butter Frosting take things to an entirely different level. They’re intensely chocolatey, perfectly gooey in the center, and finished with a fluffy peanut butter whiskey buttercream that feels just a little indulgent—in the best possible way.

I first fell in love with ultra-fudgy brownies back when I was in culinary school. One of my pastry instructors drilled into us that great brownies should taste like chocolate truffles baked into a bar. Ever since then, I’ve been obsessed with recipes that deliver that deep, rich chocolate flavor and soft, dense texture. Adding Skrewball Peanut Butter Whiskey and a peanut butter frosting makes these brownies feel like the ultimate grown-up treat.

Whether you’re serving them at a dinner party, bringing them to a game-day gathering, or simply baking something cozy for the weekend, these brownies always impress.

Why We Love This Recipe

There are so many reasons these brownies have become a favorite in my kitchen.

First, they are incredibly fudgy and rich, thanks to melted chocolate, butter, and Dutch-process cocoa powder. Second, the addition of Skrewball whiskey gives the brownies a subtle peanut butter warmth that pairs beautifully with the chocolate.  This is basically boozy brownie heaven. Perfect for St. Patricks Day!

And of course, we can’t forget the peanut butter frosting. It’s light, creamy, and just sweet enough to balance the deep cocoa flavor.

Finally, they’re incredibly easy to make. You don’t need any fancy equipment—just a bowl, a double boiler, and a mixer for the frosting.  These will quickly become your favorite brownie recipe! 

Key Ingredients You Need to Make These Whiskey Brownies

Sugar

Sugar sweetens the brownies while also helping create that signature glossy top layer that brownie lovers crave.

Dutch-Process Cocoa Powder

Dutch-process cocoa powder has been treated to neutralize its acidity. As a result, it produces a smoother, deeper chocolate flavor, which is perfect for ultra-rich brownies.

Molasses

Molasses adds moisture and a subtle caramel-like depth. It enhances the chocolate flavor and helps keep the brownies soft and chewy.

Vanilla Extract

Vanilla extract enhances the overall flavor of the brownies by rounding out the chocolate notes and adding warmth and depth. Even though it’s a small amount, it makes the chocolate taste more complex and balanced.

Eggs

Eggs provide structure while also contributing richness. They bind the batter together and help create that dense, fudgy texture.

Room Temperature Unsalted Butter

Butter adds richness and moisture. Using unsalted butter allows you to control the overall salt balance in the recipe.

Skrewball Whiskey

Skrewball whiskey adds a hint of peanut butter flavor and warmth. The alcohol cooks off in the oven, leaving behind a subtle depth that pairs beautifully with chocolate.

Chocolate Chips

Chocolate chips melt into the batter and create pockets of gooey chocolate throughout each bite.

Flour

Flour provides structure. Using just enough ensures the brownies stay dense and fudgy rather than cakey in this brownie recipe.

Salt

A teaspoon Salt balances the sweetness and intensifies the chocolate flavor.

Peanut Butter

Peanut butter is the star of the frosting. It creates a creamy, nutty flavor that pairs perfectly with the whiskey and chocolate.

Step By Step Instructions To Make These Boozy Chocolate Brownies

Preheat the oven to 350°F.

Melt the chocolate and butter.
Place chocolate and butter in a large bowl over a double boiler over medium heat. Stir until the mixture is completely melted and smooth.

Add molasses, sugar, and cocoa powder to the chocolate mixture.
Stir until everything is fully combined and glossy. Remove from heat.

Mix in remaining ingredients.
Add the eggs, Skrewball whiskey, vanilla, flour, and salt. Stir until just combined. Be careful not to overmix—the key to fudgy brownies is keeping the batter gentle.

Prepare the baking dish.
Spray a 9×13-inch glass or ceramic baking dish with cooking spray and pour the brownie batter evenly into the prepared pan.

Bake.
Bake for about 35 minutes, being careful not to overbake. The center should still look slightly soft.

Cool completely.
Allow the brownies to cool fully before frosting.

Want to add even more peanut butter to these brownies with whiskey? Chop up peanut butter cups and add them on top of the frosting!

Click here to check out the short web story for this recipe!

Additional recipes to try

Loved these brownies with whiskey? Check out my double chocolate chip cookies!

Pair a whiskey brownie with an ice cream sundae board!

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