This post may contain affiliate links. For more information, read my disclosure policy.

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!

reese's brownies in a stack


Over the past few weeks we’ve had a new resident in our yard: a squirrel. For many years I didn’t think that squirrels even existed where we lived, because I never saw one. Then, about 6 months ago, I’d see one on the back fence every once in awhile. I was surprised because we’d lived in my city for 10 years and never seen a squirrel even once.

Over the last two weeks the squirrel, who I’ve since named Steve, has taken up living on our back porch. I consistently hear him scratching under the back window and he’s taken to scurrying around on the back patio roof (which is right outside my bedroom window).

The timing of Steve’s arrival is not lost on me; Ginger passed away 2 weeks ago and Steve the Squirrel moved in shortly thereafter. No dog = no one to scare him away. In fact, when I look back, I realize that we started seeing him on the back fence right around the time Ginger started slowing down, not running and chasing the birds and barking that everything that moved.

I’m not quite sure how to squirrel-proof my back yard, but I’m willing to let Steve hang around until mid-August. I think he’ll move out quickly after that, because that’s when our new puppy will arrive.

Until then, maybe I’ll leave Steve some of my Ultimate Reese’s Brownies to snack on? Or no?

The ULTIMATE One Bowl Reese's Brownie Recipe in a stack with bite missing

As usual, I overstuffed brownies with something fantastic. In the past, I’ve done it with chocolate or Oreos or I’ve shoved them in a pie crust to make an ultimate brownie pie.

This time I started with my favorite brownie recipe and I shoved it FULL of all the Reese’s items I could find at the grocery store. These peanut butter brownies have peanut butter chips inside (you can find them in the baking aisle), peanut butter cups in the middle, and Reese’s Pieces sprinkled on top.

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!

resses brownies in a stack collage

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!

Stack of One Bowl Reese's Extreme Brownies 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 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


  • 1 3/4 cups all purpose flour
  • 3/4 cup unsweetened cocoa powder
  • 2 cups granulated sugar
  • 1 teaspoon salt
  • 5 large eggs
  • 1 cup vegetable oil
  • 1 cup peanut butter chips
  • 24 miniature Reese’s Peanut Butter Cups unwrapped
  • 1 cup Reese’s Pieces


  • Preheat oven to 350°F. Line a 9x13” 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.
Nutritional information not guaranteed to be accurate

Click here to see more PEANUT BUTTER recipes!

If you looooove brownies as much as I do be sure to check out all my brownie recipes, my peanut butter recipes, and my Reese’s recipes!

And check out these recipes from my friends: Reese’s Peanut Butter Cup Bark by Wine & Glue, Reese’s Peanut Butter Cup Bread Pudding by The Little Kitchen, or Reese’s Monster Cookies by Oh Sweet Basil.

Nutter Butter Truffle Brownies

Reese’s Brownies with an Oreo Crust

Peanut Butter Cup Gooey Bars

Last Updated on May 12, 2020

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.

Learn to Bake in 4 Days!
Get my tips, tricks and recipes to take your baking to the next level for FREE!

Leave a Comment

Your email address will not be published. Required fields are marked *

Recipe Rating


  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.