These Decadent Peanut Butter Cup Brownies are the ultimate chocolate-peanut butter dream come true! Imagine ultra-fudgy brownie batter loaded with chopped Reese’s cups, a dreamy peanut butter swirl on top, and even more peanut butter cups scattered across the surface. Every bite is rich, gooey, and packed with that irresistible candy-bar crunch.
Perfect for bake sales, potlucks, birthday parties, or midnight cravings—this easy one-bowl recipe is Pinterest-famous for a reason. Pin it now so you never lose it!
Why You’ll Obsess Over This Recipe
- Fudgy, not cakey — thanks to the perfect butter-to-cocoa ratio
- Peanut butter in every bite — chopped cups inside + swirl on top
- Ready in under 45 minutes — no fancy equipment needed
- Crowd-pleaser — chocolate lovers and peanut butter fans unite!
Ingredients (makes 16 generous squares)
- 1 cup (226g) unsalted butter, melted
- 2 cups (400g) granulated sugar
- 3 large eggs, room temperature
- 2 teaspoons pure vanilla extract
- 1 cup (125g) all-purpose flour
- ¾ cup (65g) unsweetened cocoa powder
- ½ teaspoon salt
- ½ teaspoon baking powder
- 1½ cups chopped Reese’s Peanut Butter Cups (mini or full-size), divided
- ⅓ cup creamy peanut butter (for the swirl)
Reese’s Brownies with Peanut Butter Fudge Frosting + Video
Step-by-Step Instructions
1. Prep Preheat oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving overhang for easy removal.
2. Mix the batter In a large bowl, whisk melted butter and both sugars until glossy. Add eggs and vanilla; stir until smooth. Sift in flour, cocoa powder, salt, and baking powder. Fold gently until just combined—do NOT overmix for that perfect fudgy texture!
3. Add the magic Stir in 1 cup of the chopped peanut butter cups. Pour batter into the prepared pan and spread evenly.
4. Create the swirl Warm the peanut butter in the microwave for 10 seconds if needed. Dollop spoonfuls over the batter, then drag a knife through to create beautiful swirls.
5. Top it off Sprinkle the remaining ½ cup chopped peanut butter cups across the top for extra crunch and wow factor.
6. Bake Bake 25–30 minutes. The edges should be set, but the center should still have a few moist crumbs on a toothpick. (25 minutes = extra fudgy!)
7. Cool & slice Cool completely in the pan (at least 2 hours). Lift out using parchment, slice into squares, and try not to eat them all at once!
Peanut Butter Swirled Brownies
Pro Tips for Bakery-Worthy Results
- Fudgy secret: Slightly underbake and let them finish setting as they cool.
- Room-temp eggs: They blend smoother for a silkier texture.
- Mini cups = more pieces: Use Reese’s minis for peanut butter in every single bite.
- Add chocolate chips: Toss in ½ cup semi-sweet chips for next-level decadence.
- Don’t skip the parchment: Makes clean removal and picture-perfect squares every time.
Delicious Variations
- Peanut Butter Frosting: Top cooled brownies with a quick peanut butter buttercream and extra chopped cups.
- Salted Caramel Drizzle: Swirl caramel with the peanut butter for a salty-sweet twist.
- Dark Chocolate Version: Swap half the cocoa for Dutch-process for deeper flavor.
- Mini Muffins: Bake in a muffin tin for portable party bites.
Peanut Butter Pie Brownies – Flavor Mosaic
Storage & Serving Ideas
Store in an airtight container at room temperature for up to 5 days (if they last that long!). Freeze slices for up to 2 months—thaw overnight for fresh-from-the-oven taste.
Serve warm with vanilla ice cream and a drizzle of chocolate sauce, or pair with cold milk for the ultimate afternoon treat.
Ready to Bake?
These Decadent Peanut Butter Cup Brownies are guaranteed to become your new go-to dessert. Tag me if you make them—I want to see your creations!
Save this pin for later, share with your baking buddies, and get ready for the compliments to roll in.
