Whiskey Brownies with Peanut Butter Frosting

If you’re looking for a dessert that feels indulgent, a little grown-up, and incredibly satisfying, these Whiskey Brownies with Peanut Butter Frosting are it.

Rich fudge brownies get a splash of whiskey for warmth and flavor, then get topped with a fluffy peanut butter buttercream that makes the whole dessert feel over-the-top (in the best way).

They’re the kind of brownies you bring to a holiday party, game night, or girls’ weekend and instantly become the person everyone asks for the recipe from. And yes — they start with boxed mix, but trust me: no one will ever know.

Why You’ll Love These Whiskey Brownies with Peanut Butter Frosting

• Boozy twist on a classic dessert

• Easy shortcut using brownie mix

• Soft, fudgy texture with melty chocolate chips

• A fluffy peanut butter frosting that steals the show

• Perfect for entertaining, gifting, or freezing for later

Whiskey Brownies with Peanut Butter Frosting

Rich whiskey brownies topped with fluffy peanut butter frosting. Easy, boozy, and perfect for parties, holidays, or a decadent treat. Starts with boxed brownie mix!

Print Recipe Pin Recipe

Prep Time 5 minutes mins

Cook Time 35 minutes mins

Cooling Time 30 minutes mins

Servings: 16

Course: Dessert

Cuisine: American

Ingredients Method Notes

Ingredients

  

Whiskey Brownies

• 2 19.9 oz boxes Betty Crocker Dark Chocolate Brownies
• ½ cup water
• 1 cup vegetable oil
• 2 tablespoons Screwball whiskey
• 4 large eggs
• ½ cup chocolate chips
• ½ cup peanut butter chips

Peanut Butter Frosting

• 1 cup butter softened
• 3 cups powdered sugar
• ½ cup creamy peanut butter
• 4 tablespoons Screwball whiskey

Topping

• 1 cup chocolate chips
• 1 cup peanut butter chips

Method

 

Make the Brownies

1. Preheat oven to 350°F. Grease a 9×13" glass or ceramic baking dish with cooking spray.
2. In a large mixing bowl, combine both brownie mixes, water, oil, whiskey, and eggs. Stir until just combined.
3. Fold in ½ cup chocolate chips and ½ cup peanut butter chips. Avoid overmixing.
4. Pour batter into the prepared pan and smooth the top.
5. Bake for 35 minutes. During the last 5 minutes, sprinkle the remaining chocolate chips and peanut butter chips across the top.
6. Insert a toothpick into the center — if it comes out mostly clean (a few crumbs are fine), the brownies are done.
7. Cool completely before frosting.

Make the Peanut Butter Frosting

1. In the bowl of a stand mixer, beat softened butter, powdered sugar, peanut butter, and whiskey.
2. Whip on high speed for 5 minutes, or until fluffy.

Finish

1. Once brownies are fully cooled, spread the frosting evenly across the top.
2. Slice and enjoy.

Notes

Store in an airtight container at room temperature for up to 2 days, or refrigerate for up to 5 days. Brownies can also be frozen (frosted or unfrosted) for up to 3 months.

Variations & Tips

• Swap the whiskey: Bourbon or Irish whiskey work well.

• Extra peanut flavor: Add chopped peanuts on top.

• No alcohol version: Replace whiskey with milk or coffee.

• More chocolate: Drizzle ganache or melted chocolate over the frosted brownies.

How to Store Whiskey Brownies with Peanut Butter Frosting

Store in an airtight container at room temperature for up to 2 days, or refrigerate for up to 5 days. Brownies can also be frozen (frosted or unfrosted) for up to 3 months.

Helpful Tools

• 9×13″ baking pan

• Offset spatula (for frosting)

• Stand mixer or hand mixer

• Parchment sheets

• Cooling rack

• Serrated knife or brownie cutter

Planning a party? Save this recipe to your Desserts or Cocktail-Inspired Treats Pinterest board so you can find it later!