Name: Reese’s Peanut Butter Cup Brownies
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: American
Ingredients: 1 box brownie mix (plus ingredients listed on the box); 1/2 cup creamy peanut butter; 1 cup mini Reese’s peanut butter cups, halved; Optional: extra peanut butter cups for topping

Jump to Recipe·Print Recipe

Fudgy, rich, and loaded with peanut butter goodness, these Reese’s Peanut Butter Cup Brownies are a dream come true for chocolate and peanut butter lovers like me. Using a simple boxed brownie mix as the base, I layer in creamy peanut butter swirls and plenty of chopped mini Reese’s cups for a dessert that’s gooey, indulgent, and guaranteed to satisfy any sweet tooth.

Reese’s Peanut Butter Cup Brownies

Ingredients

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

1 box brownie mix (plus ingredients listed on the box)

½ cup creamy peanut butter

1 cup mini Reese’s peanut butter cups, halved

Optional: extra peanut butter cups for topping

Directions

I preheat the oven according to the brownie mix instructions—usually between 325°F and 350°F.

Then I line an 8x8-inch or 9x9-inch baking dish with parchment paper or lightly grease it to prevent sticking.

I prepare the brownie batter as instructed on the box.

I pour half of the brownie batter into the pan and spread it out evenly.

I drop spoonfuls of peanut butter over the batter, then use a knife to swirl it in for a marbled effect.

I sprinkle half of the halved mini Reese’s cups on top.

I carefully pour the rest of the batter over the top and spread it to cover.

I repeat the peanut butter swirl and add the remaining Reese’s cup halves.

I bake the brownies according to the package directions or until a toothpick inserted comes out with a few moist crumbs.

I let them cool completely in the pan so they firm up before slicing—this makes for cleaner, neater cuts.

Servings and timing

This recipe makes 12 brownies.

Prep Time: 10 minutes

Cooking Time: 35 minutes

Total Time: 45 minutes

Calories: Approximately 310 kcal per serving

Variations

I sometimes add a handful of chocolate chips to the batter for extra chocolate richness.

For a crunchier texture, I’ve used chopped roasted peanuts in place of some of the Reese’s cups.

I love drizzling melted chocolate or extra peanut butter over the top after baking for an added decorative touch.

To switch it up, I’ve tried using white chocolate Reese’s for a unique twist.

Storage/Reheating

I store these brownies in an airtight container at room temperature for up to 3 days or in the fridge for up to a week. If I want them warm and gooey again, I microwave a slice for about 10–15 seconds. For longer storage, I wrap individual squares tightly in plastic wrap and freeze them for up to 2 months—just thaw or reheat before serving.

FAQs

How do I know when the brownies are done?

I look for a toothpick inserted in the center to come out with a few moist crumbs—if it’s completely clean, I’ve probably overbaked them a bit. I aim to take them out just before they fully set so they stay fudgy.

Can I use natural peanut butter?

I prefer creamy commercial peanut butter for the best swirl texture and flavor. Natural peanut butter can separate and may not swirl as well, but it can work if stirred thoroughly.

Can I make this with homemade brownie batter?

Absolutely. I’ve used my favorite homemade fudgy brownie recipe in place of the box mix, and it works just as well—just adjust baking times as needed.

What size pan is best?

An 8x8-inch pan yields thicker brownies, while a 9x9-inch gives slightly thinner ones. I go with the 8x8-inch when I want a more decadent, gooey result.

Can I double the recipe?

Yes, I’ve doubled the ingredients and baked them in a 9x13-inch pan. I just make sure to adjust the baking time and keep an eye on doneness with a toothpick test.

Conclusion

These Reese’s Peanut Butter Cup Brownies are my go-to when I need a quick, crowd-pleasing dessert with minimal effort. I love how easy they are to throw together with a box mix and a few extra ingredients. Whether I’m baking for a party, holiday gathering, or just craving something sweet, these rich, peanut buttery brownies always hit the spot.

📖 Recipe:

Reese’s Peanut Butter Cup Brownies

5 Stars 4 Stars 3 Stars 2 Stars 1 Star

No reviews

Author: Cheryl
Total Time: 45 minutes
Yield: 12 brownies
Diet: Vegetarian

Print Recipe

Description

Fudgy, rich, and loaded with peanut butter goodness, these Reese’s Peanut Butter Cup Brownies transform a simple boxed brownie mix into a decadent treat packed with swirls of creamy peanut butter and chunks of mini Reese’s cups.

Ingredients

1 box brownie mix (plus ingredients listed on the box)

½ cup creamy peanut butter

1 cup mini Reese’s peanut butter cups, halved

Optional: extra peanut butter cups for topping

Cook Mode Prevent your screen from going dark

Instructions

Preheat the oven according to the brownie mix instructions (typically between 325°F and 350°F).
Line an 8x8-inch or 9x9-inch baking dish with parchment paper or lightly grease it.
Prepare the brownie batter as instructed on the box.
Pour half of the brownie batter into the prepared pan and spread evenly.
Drop spoonfuls of peanut butter over the batter and swirl with a knife to create a marbled effect.
Sprinkle half of the halved mini Reese’s cups on top of the batter.
Pour the remaining brownie batter over the top and spread to cover.
Repeat the peanut butter swirl and sprinkle the remaining Reese’s cup halves on top.
Bake according to package directions, or until a toothpick inserted in the center comes out with a few moist crumbs.
Let brownies cool completely in the pan before slicing for cleaner cuts.