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The ULTIMATE Reese’s Brownies! This is a one bowl brownie recipe FULL of 3 KINDS of Reese’s: peanut butter cups, peanut butter chips, and Reese’s Pieces!! The best brownie recipe for peanut butter lovers!

stacked brownies with yellow and orange reeses pieces baked inside.

Why You’ll Love This Recipe

Ever since I made my one bowl fudgy brownie recipe I have been making brownies nonstop – and this time I decided to add every single peanut butter candy in my pantry. We are HUGE peanut butter chocolate lovers in this house – and I knew the combo would be amazing.

Skip the microwave and stand mixer – these are easy to make, one bowl, and are so chocolatey, rich, and fudgy! They’re a favorite of several friends of mine, who make them every chance they get. I’ve heard these proclaimed one of the best desserts you’ll ever try – and I agree!

If you’ve a peanut butter and chocolate lover or you are as obsessed with Reese’s as I am, THESE Ultimate Reese’s Brownies are for you!

ingredients in reeses brownies laid out on a white marble countertop.

Important Ingredients

  • Oil – instead of butter these use oil which keeps them nice and rich.
  • Eggs – 5 large eggs in one brownie recipe – seems like a lot but that’s where all that fudgy texture comes from.
  • Cocoa – I used natural unsweetened cocoa powder but you can use dutch-process cocoa if you want.
  • Peanut Butter Candy – clean out your pantry and use a combination of Reese’s Pieces, chopped peanut butter cups, and peanut butter chips!

How to make Peanut Butter Brownies

  • Mix together your brownie batter by stirring all the ingredients together in a large bowl. Fold in peanut butter chips.
  • Pour mixture into a 9×13-inch pan lined with foil or parchment paper. Add all your Reese’s candies.
  • Bake until a toothpick comes out with just a few crumbs.
stacked brownies with yellow and orange reeses pieces baked inside.

Expert Tips

  • Feel free to swap out the peanut butter chips for chocolate chips.
  • You could even top these with peanut butter frosting for even more flavor.
  • Cutting brownies with a plastic knife will make your cuts clean!


Store cooled Reese’s brownies in an airtight container. These are SO good and they not only taste good warm but you can freeze them for later too. I made them ahead and froze them for a party and they tasted just as good as fresh. And EVERYONE loves them!

stacked brownies with yellow and orange reeses pieces baked inside.

The ULTIMATE One Bowl Reese’s Brownie Recipe

4.03 from 37 votes
This is the ULTIMATE Reese’s Brownie Recipe! It’s a one bowl brownie recipe FULL of 3 KINDS of Reese’s: peanut butter cups, peanut butter chips, and Reese’s Pieces!!
Total Time 45 minutes
Yield 24 brownies
Serving Size 1 serving


  • 1 ¾ cups (217g) all purpose flour
  • ¾ cup (60g) unsweetened cocoa powder
  • 2 cups (400g) granulated sugar
  • 1 teaspoon salt
  • 5 large eggs
  • 1 cup (237ml) vegetable oil
  • 1 cup (170g) peanut butter chips
  • 24 miniature Reese’s Peanut Butter Cups unwrapped
  • 1 cup Reese’s Pieces
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  • Preheat oven to 350°F. Line a 9×13” pan with foil and spray with nonstick cooking spray.
  • Whisk flour, cocoa, sugar, and salt in a large bowl. Stir in eggs and oil until completely mixed. Stir in the peanut butter chips.
  • Spread half the batter in the prepared pan. Top with peanut butter cups (whole, or you can chop them if you prefer). Then top with the remaining batter and sprinkle the Reese’s Pieces over the top.
  • Bake for 20-26 minutes or until they just stop jiggling a little. These are better under done than over done! Cool before slicing.
  • Store in an airtight container for up to 3 days or freeze for up to one month.

Recipe Notes

  • Store in an airtight container or freeze.

Recipe Nutrition

Serving: 1serving | Calories: 272kcal | Carbohydrates: 34g | Protein: 4g | Fat: 15g | Saturated Fat: 4g | Polyunsaturated Fat: 6g | Monounsaturated Fat: 4g | Trans Fat: 0.1g | Cholesterol: 35mg | Sodium: 151mg | Potassium: 116mg | Fiber: 2g | Sugar: 24g | Vitamin A: 53IU | Vitamin C: 0.02mg | Calcium: 21mg | Iron: 1mg
Nutritional information not guaranteed to be accurate
Course Dessert
Cuisine American

Favorite Brownie Recipes

Dorothy Kern

Welcome to Crazy for Crust, where I share recipes that are sometimes crazy, often with a crust, and always served with a slice of life.

4.03 from 37 votes (36 ratings without comment)

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  1. I made these last night and they were VERY undercooked. I even put them back in the oven for an extra 20 minutes and still pure goo in the middle. I followed the recipe to the tee. Any idea what may have gone wrong?

    1. What kind of pan do you use? I can only think that maybe glass vs metal caused the issue? I’ve never had a problem with these – they’re supposed to be gooey but not wet.