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    Home » Desserts » Reese's Pieces Peanut Butter Brownies

    Feb 26, 2009 · Modified: Apr 15, 2021 by Sues · This post may contain affiliate links, uses cookies, and generates income via ads · View privacy policy + disclosure statement linked in footer · 26 Comments

    Reese's Pieces Peanut Butter Brownies

    Jump to Recipe Print Recipe

    These Reese's Pieces Peanut Butter Brownies are packed with peanut butter, chocolate, Reese's Peanut Butter Cups, and Reese's Pieces. Peanut butter lovers, rejoice!

    Head-on view of a stack of three Reese's Pieces peanut butter brownies with box of Reese's Pieces in the background with recipe title at top

    (This recipe for Reese's Pieces Peanut Butter Brownies was originally published in February 2009, but has been updated with new photos and content.)

    Is there such a thing as too much peanut butter? If you're thinking "yup, there is!" then you should probably leave now because you're really not going to like these Reese's Pieces brownies. They involve peanut butter in three forms.

    But you know what? They're not overly omg sticking to the top of your mouth peanut butter brownies. I think all of that chocolate really helps balance things out. If you don't love peanut butter, you must at least love peanut butter and chocolate together, right??

    I first made these chocolate peanut butter brownies wayyy back in 2009, after seeing the recipe on Grumpy's Honeybunch. Sometimes I laugh to myself when I re-read my old posts because I say things like, "next time I'd add peanut butter into the batter." Okayyy, Sues, then why the heck didn't you add peanut butter into the batter before posting about them??

    It's like, "here, I'm giving you a recipe, but there are like 10 things I'd do differently next time I make it, so..." Anyway, I suppose blogging times were different back then. So, now that we're in a new era, I went back and made some adjustments to the original recipe until I got to my ideal chocolate peanut butter brownies and I'm updating the recipe here for you now.

    Reese's Pieces Peanut Butter Brownies Recipe

    But don't worry, these peanut butter brownies are still super easy to make and are made in a 13x9 pan, which means you'll end up with 24 chocolate peanut butter brownies. Which means you can probably share a couple of them and still have enough for yourself.

    All you have to do is mix the wet ingredients together, mix the dry ingredients together, and then combine the two. Don't forget to fold in the Reese's Peanut Butter Cups!

    Then spread the batter in the pan, top with Reese's Pieces, and bake away.

    Collage showing process for making Reese's Pieces peanut buttery brownies, including chocolate brownie batter in pan with Reese's Pieces on top, peanut butter brownie batter in mixer, and crushed peanut butter cups in measuring cup

    Oh wait, before we move on, we need to talk about the fact that Reese's Pieces do not actually have chocolate in them. Does that blow your mind?

    I realize I brought that up the last time I posted a Reese's Pieces recipe, but I feel like I need to make this public service announcement again. If you were already aware then carry on, nothing to see here, I've just clearly been living under a rock.

    Either way, I think there's enough chocolate in these Reese's brownies to excuse the lack of chocolate in Reese's Pieces.

    Overhead view of stack of three Reese's Pieces peanut butter brownies with Reese's Pieces and more brownies in background

    And now that I've adjusted the original recipe, there's also enough peanut buttery goodness to my liking.

    Because check out that chocolate. I mean, just look at it. It's so fudgy and intense that you need a little bit of peanut butter to cut through it.

    Landscape head-on view of stack of three chocolate Reese's Pieces peanut butter brownies with Reese's Pieces and more brownies in background

    And obviously the Reese's Pieces scattered about on top add a little bit of crunch. And more peanut butter brownie balance.

    These are totally the kind of brownies you want to bring to a party. Or sell at a bake sale. Or just have in your kitchen at all times so whenever a guest pops in, you can say, "oh, would you like a Reese's Pieces brownie?"

    Something tells me you'd start to have guests wayyy more often than you'd like.

    More Peanut Butter Desserts

    If you love all things peanut butter and peanut butter desserts as much as I do, be sure to check out some of my other favorite recipes:

    • Peanut Butter Toffee Cookies
    • Chocolate Peanut Butter Cheerios Granola Bars
    • Peanut Butter Chocolate Muffins
    • Peanut Butter and Jelly Cupcakes
    • Peanut Butter Blondies with Chocolate Ganache
    • XL Peanut Butter Cookies with Sprinkles
    • Peanut Butter Banana Pupcakes (because your dog probably loves peanut butter, too!)
    • Reese's Pieces Pudding Cookies (from Peas and Crayons)
    • Reese's Peanut Butter Chocolate Cupcakes (from Life Made Sweeter)
    Head-on view of a stack of three Reese's Pieces peanut butter brownies with box of Reese's Pieces in the background

    But the best part is that these peanut butter brownies are classic brownies that were delicious in 2009 and are still delicious almost nine years later.

    And if they're not still delicious twenty years from now, well then, let's just say 2038 is not a time I'm looking forward to very much.

    Are you always in the mood for chocolate and peanut butter? If not, what do you prefer?

    Stack of Reese's Pieces peanut butter brownies with Reese's Pieces candy in background

    Reese's Pieces Peanut Butter Brownies

    Reese's Pieces Peanut Butter Brownies are packed with peanut butter, chocolate, Reese's Peanut Butter Cups, and Reese's Pieces. Peanut butter lovers, rejoice!
    5 from 2 votes
    Print Pin Rate
    Course: Dessert
    Cuisine: American
    Keyword: Brownie Recipes, Peanut Butter and Chocolate, Peanut Butter Desserts, Reese's Pieces Desserts
    Prep Time: 15 minutes
    Cook Time: 35 minutes
    Total Time: 50 minutes
    Makes: 24 brownies
    Author: We are not Martha

    Ingredients

    • 1 cup (2 sticks) unsalted butter, room temperature
    • 2 ½ cups granulated sugar
    • ½ cup creamy peanut butter
    • 4 large eggs
    • 1 ½ Tbsp vanilla
    • 1 ½ cups all-purpose flour
    • 1 cup unsweetened cocoa powder
    • 1 tsp salt
    • 1 ½ cups chopped peanut butter cups (about 28 peanut butter cups; note that there are about 38 in a 12 oz. bag)
    • ½ cup Reese's Pieces

    Instructions

    • Pre-heat oven to 350 degrees and lightly grease a 9×13 baking dish.
    • In the bowl of a stand mixer or in a large bowl with a hand mixer, cream together butter and sugar until light and fluffy.
    • Beat peanut butter into the mixture until smooth. Add eggs one at a time, mixing well after each addition. Beat in vanilla.
    • In a separate large bowl, whisk together flour, cocoa powder, and salt.
    • Add the dry mixture to the wet ingredients and mix until just combined. Fold peanut butter cups into batter.
    • Pour the mixture into prepared baking dish and sprinkle Reese's Pieces over the top.
    • Bake at 350 degrees for about 35 minutes, until a toothpick comes out clean. Set pan on a wire rack and let cool for about 10 minutes before slicing.

    Notes

    Recipe adapted from Grumpy's Honeybunch
    Share a Photo of Your Finished Recipe!Mention @wearenotmartha and share a photo if you've made the recipe!

    View Web Story for recipe

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    Comments

    1. Sara says

      February 26, 2009 at 12:29 pm

      these were AMAZING! one of the best desserts yet.

    2. VeggieGirl says

      February 26, 2009 at 2:08 pm

      HOLY FREAKING YUM!!!!! I'll take a dozen of those, please!!! 😀

    3. suburban prep says

      February 26, 2009 at 3:13 pm

      OMG they look fantastic.

    4. Kelsey says

      February 26, 2009 at 4:00 pm

      mmmmmmmmmmmmmmm

    5. Alisa - Frugal Foodie says

      February 26, 2009 at 11:33 pm

      So much Reese's goodness!!

    6. Kelly says

      February 27, 2009 at 8:03 am

      It was nice meeting both of you last night. I look forward to following your blog and hopefully seeing both of you again at another WBUR event. I'm normally not a huge reese's pieces fan but in those brownies they look dangerous.

    7. E says

      February 28, 2009 at 6:52 am

      I have found mini's at Trader Joe's (they are not Reese's brand, but jut as good!)

    8. Kat says

      March 02, 2009 at 5:46 am

      These are a must try. My husband loves reese's pieces so I know already these will be a hit!

    9. Shelley says

      March 02, 2009 at 6:13 am

      Made these on Saturday, SOOOO yummy! I really need to give the rest away because I can't stop myself!

    10. Jenn says

      April 11, 2009 at 1:43 pm

      I was hoping to make these, but didn't have the reeses cups I thought I did! And you can find the mini Reeses Pieces with the chocolate chips in the baking aisle.

    11. HoneyB says

      April 26, 2009 at 7:40 am

      Just seeing these makes me want them again! They are the devil these brownies are.. ;o)

    12. choccycake says

      June 30, 2009 at 1:37 am

      Great photos, they look delicious, will try the recipe sometime - thanks for sharing!

    13. Adam K says

      July 06, 2009 at 1:42 pm

      Tastes pretty good upon first contact, although it needs a lot more bakin time than 30 minutes. At least 45 minutes. We had very very fudgy and drippy brownies after 30 minutes.

    14. Girl says

      August 14, 2009 at 4:48 pm

      OMG! I am so looking forward to baking these! I am going to bake them as a surprise for my boyfriend. lol. Hopefully, they will turn out as yummy as the pictures! I have a tendency of overcooking sweets. So wish me luck!!

    15. Girly Girl says

      December 14, 2009 at 7:23 pm

      I'm looking forward to making this they look delis

    16. Merrie says

      March 25, 2010 at 12:50 pm

      Reese's Pieces are my husband's favorite, so I made these for his birthday a couple of days ago. SO GOOD! I never bake or cook, so the step by step instructions and pictures were very helpful. Thank you!!

    17. Colette says

      May 12, 2010 at 4:06 pm

      Just made these for my evening master's class - the guys in there requested something with Reese's Pieces. These looked fabulous, so I tried them. Will let you know what the verdict was. I think they will love them!

    18. Sharon says

      June 24, 2010 at 5:42 pm

      These are just what I am looking for to make for nephew's birthday, he loves peanut butter and chocolate! Thanks for the great idea of putting the reese's pieces on the top! I might suggest that you check out my daughter-in-law-to-be's (I love saying that) blog, it's minibaker.com! Happy Baking!

    19. Ellen says

      September 08, 2010 at 12:37 pm

      whoa! these are amazing. i made two batches in 3 days because my family devoured the first one. they are delicious..so rich and sweet, like eating fudge! if you have an oven like mine, that typically cooks really fast, you may want to put them in for about 30 minutes. the first batch i did for 35. they were still really good but the edges came out a little dark. 30 minutes was perfect for my taste.

    20. Christina says

      March 16, 2011 at 1:19 am

      Truly delicious. <3

    21. Kimberly says

      May 30, 2011 at 12:38 am

      These are so yummy! My fiancee asks me to make them all the time. The only problem I had was getting the middle to cook evenly with the edges. Sometimes they are just too gooey for my liking. But hey... some people like gooey.

    22. Tyler says

      July 07, 2011 at 5:53 pm

      These look soo good, I'm gonna have to try them.

    23. Emily says

      February 17, 2012 at 4:15 pm

      Mini Reese's are just what they're called. Miniature peanut butter cups. They come in small plastic bags. And they don't have wrappers on them. Really yummy.

    24. Tiffany says

      October 23, 2012 at 10:47 pm

      These look delicious! I've featured them in my blog post about Reese's Pieces recipes.

    25. Cheryl A. says

      December 15, 2017 at 10:57 am

      5 stars
      Thank you so much!!! These look so amazing!! Cheryl

    26. jayden says

      September 09, 2019 at 9:47 am

      5 stars
      These were the best thing that ever entered my mouth!! I would recommend it!

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