This post may contain affiliate links. Please read our privacy policy.

Peanut Butter Cup S’mores Brownies will easily be your new favorite dessert. Who could possibly resist this ooey, gooey combination?

Peanut Butter Cup S'mores Brownies will easily be your new favorite dessert. Simple and so delish!

This post is sponsored by Campfire® Marshmallows. Thank you for continuing to support the brands that make My Baking Addiction possible.

If you’re at all like me, you pretty much can’t believe it’s already June. I mean, you guys, there’s only 203 days until Christmas.

I know it seems ridiculous that I even Googled that, but I feel like it was just yesterday that I was trying to find a place to hide Elle’s huge doll house. Which, by the way, I thought was the best Christmas gift ever.

Let’s just say, she’s over it. And it’s now in the basement collecting dust and housing more blind bag figurines than I care to admit we’ve purchased.

If you’re the parent of a toddler and they’ve discovered blind bags, you feel me – right?

Peanut Butter Cup S'mores Brownies will easily be your new favorite dessert. They're ooey, gooey and totally delicious!

Since I clearly have no concept of time, I honestly didn’t have a clue that Memorial Day was coming until it was one day away. And although we didn’t have an epic cookout, we did have a relaxing weekend at home complete with burgers and brats.

Since Ohio weather is pretty much the worst right now, there was an 80% chance of rain that weekend, so we ended up cooking indoors on our grill pan. That was totally fine by me because I didn’t have to wash the smell of charcoal and burnt brats from my hair before bed.

Even though I love a good microwave s’more, it felt like I should do more, it being a holiday weekend and all. I decided to kick it up a notch and make Peanut Butter Cup S’mores Brownies.

And by a notch, I mean adding a graham cracker crust and mini peanut butter cups to my favorite brownie mix. Because let’s face it, I said it was a relaxing weekend and I’m a huge fan of boxed brownie mixes.

If you’re not a fan of brownie mixes, no worries, we can still be friends, just substitute your favorite from-scratch brownie recipe for the mix. You can even sub out the peanut butter cups for another type of chocolate candy (think Snickers, Take5, etc.) but I will definitely question you if you say you don’t like peanut butter.

Peanut Butter Cup S'mores Brownies will easily be your new favorite dessert. Super simple and super delish!

You can substitute any of those components for these brownies, but you have to pinky swear that you won’t skimp on the layer of Campfire® Marshmallows. Because that, my friends, is a layer of ooey-gooey perfection.

Campfire® Marshmallows are my absolute favorite because they’re perfectly sweet and ultra-soft which makes them perfect for roasting, melting, or eating straight from the bag. And stuffing in brownies.

These Peanut Butter Cup S’mores Brownies are perfect for last minute summer get-togethers, or eating your feelings because it’s been raining for what feels like forever. Regardless of why you choose to make them, I hope you love them as much as we do!

Peanut Butter Cup S'mores Brownies will easily be your new favorite dessert. Easy and absolutely delicious!

If you’re looking for more delicious recipes using Campfire® Marshmallows, be sure to check out this Pineapple Fluff and this No-Bake S’mores Cheesecake – both are simple to make and absolutely perfect for summer! You can also check out the Campfire blog and Facebook page.

Want to save this recipe?
Enter your email and get it sent to your inbox!
Please enable JavaScript in your browser to complete this form.

Peanut Butter Cup S'mores Brownies

By: Jamie
No ratings yet
Prep: 15 minutes
Cook: 50 minutes
Total: 1 hour 5 minutes
Servings: 12
Peanut Butter Cup S’mores Brownies will easily be your new favorite dessert. Who could possibly resist this ooey, gooey combination?


For the crust:

  • 1 cup graham cracker crumbs
  • 1 tablespoon sugar
  • 5 tablespoons unsalted butter melted

For the brownies:

  • 18- ounce Ghiradelli brownie mix plus the ingredients listed on the box egg, oil, water
  • 1 cup miniature peanut butter cups

For the topping:

  • 21 Regular Campfire® Marshmallows


  • Preheat oven to 325°F. Line an 8 x 8 pan with parchment paper or foil and spray with nonstick cooking spray.
  • In a medium bowl, mix together the graham cracker crumbs, sugar and butter.
  • Evenly press crumbs into the bottom of the prepared pan. Bake crust in preheated oven for 7 minutes.
  • Once the crust is baked, prepare the brownie mix according to package directions. Fold in mini peanut butter cups before adding the brownie batter to the prepared pan.
  • Baked in preheated oven for 40 minutes. Allow brownies to cool for 1 hour before topping.
  • When you're ready to serve the brownies, cut 21 Regular Campfire® Marshmallows in half and layer the marshmallows (sticky side down) across the top of the brownies.
  • Toast the marshmallows under the broiler until golden, (watch this like you have never watched anything before because you do not want the marshmallows to burn), about 2 minutes.
  • Cool slightly and cut into 12 squares.

Leave a comment

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

Recipe Rating

This site uses Akismet to reduce spam. Learn how your comment data is processed.


  1. Patty says:

    Can you make these ahead even toasting the marshmallows and serve them later? Thanks. 

    1. Jamie says:

      Hi, Patty! I would recommend making the brownies and then putting on the marshmallow and toasting right before you serve. Let me know how you like them!

  2. Kelly Y. says:

    Hi Jamie! These look amazing! I can’t wait to try them. Question: is it necessary to bake the graham cracker crust first? Couldn’t I just pour the brownie batter over it and bake it all at the same time? Thanks!

    1. Jamie says:

      Baking the crust gives it a sturdier foundation so it doesn’t crumble when you slice it. You can definitely try it the other way though. :)