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You are here: Home / Desserts / Cookies / Peanut Butter S’mores Cookie Bars

Peanut Butter S’mores Cookie Bars

August 20, 2018 Updated February 11, 2020 BySam 13 Comments

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Peanut Butter S'mores Cookie Bars

These Peanut Butter S’mores Cookie Bars are made with a chewy, graham cracker infused peanut butter cookie base, are loaded with pockets of melty mini marshmallows, and decorated with real milk chocolate bar pieces!

peanut butter s'mores cookie bars

These peanut butter s’mores cookie bars are a rare recipe of mine that turned out absolutely perfectly on the first try.

It almost never happens that I like a recipe enough the very first time I make it that I don’t feel the need to make it again, tweaking this and that trying to improve the flavor or chewiness or whatever I have in my mind at the moment that needs improvement. Case in point: my homemade brownies took approximately 27 tries and 8 months to get just right. Despite this, these cookie bars didn’t even make it to my photography studio (AKA my living room) and I ended up having to make them again, anyway, just so that I could take pictures.

I’d mostly like to blame Zach for eating half the pan before they even finished cooling, but since I ate the other half I don’t think that would be entirely fair. They’re undoubtedly addictive, and totally delicious, and I think you’re going to enjoy them just as much as we did.

Self control, what is that, anyway?

Freshly cut peanut butter s'mores cookie bars

Here’s what I love about these peanut butter s’mores cookie bars, and what I think you’re going to love about them, too.

  1. Subtle graham cracker flavor that complements the peanut butter perfectly 👌🏼
  2. Soft and chewy peanut butter cookie base! Not only is the cookie layer already soft on its own, but all those mini marshmallows that you’re going to fold into the batter are going to melt away as they bake creating gooey tunnels of chewy marshmallow goodness (and a lightly crisp, crackly top wherever the marshmallows touch the surface of your cookie bars). It’s absolutely heaven. Yum. I’m so hungry right now.
  3. Real Hershey bars for that authentic s’mores flavor. Sure, you could use milk chocolate chips but real s’mores flavor calls for real s’mores ingredients, so grab yourself 4 Hershey bars, maybe make it 5 because if you’re anything like me you’re going to eat a whole candy bar’s worth while you’re chopping them up, anyway.

Ingredients for peanut butter s'mores cookie bars

Tips for Making Peanut Butter S’mores Cookie Bars

I swear I didn’t mean to make this post just a bunch of bullet points, but let’s talk tips now.

  • Crunchy or creamy peanut butter will work in this recipe, but I don’t recommend using a natural peanut butter.
  • This batter is thick, so thick that I actually broke one of my favorite spatulas trying to stir in the marshmallows and chocolate by hand. The milk does help thin it out a bit, just beware that it’s going to take a little muscle if you want to stir the add-ins by hand, and it may be too thick even for an electric hand mixer.
  • I recommend using a metal pan when baking simply because that’s what I’ve used and tested. A glass pan will work, but it will likely take your cookie bars longer to finish baking.
  • As with my cookie bar and brookie recipes I always opt for my baked goods to be just slightly under-baked when pulling them out of the oven. I recommend using a toothpick and looking for a few moist crumbs (not wet batter, just fudgy crumbs) on the toothpick rather than waiting for a completely clean one to indicate it’s done. The peanut butter s’mores bars will finish cooking as they cool, and pulling them out before they’re completely baked through helps to keep them soft and chewy.

A slice of peanut butter s'mores bars

Enjoy!

More Recipes To Try:

  • S’mores Cereal Bars
  • Cookie Cake
  • Peanut Butter Shortbread Bars
  • Peanut Butter Chocolate Chunk Cookies
  • Peanut Butter Fudge Stuffed Brownies

 

Peanut butter s'mores bars

Peanut Butter S'mores Bars

These PEANUT BUTTER S'MORES COOKIE BARS are made with a chewy, graham cracker infused peanut butter cookie base, mini marshmallows and real milk chocolate!
5 from 1 vote
Print Pin Rate
Course: cookie
Cuisine: American
Keyword: cookie bars, easy desserts, party desserts, s'mores
Prep Time: 15 minutes
Cook Time: 25 minutes
Total Time: 40 minutes
Servings: 24 squares
Calories: 273kcal
Author: Sam Merritt

Ingredients

  • 1 cup unsalted butter softened (227g)
  • 1 cup creamy peanut butter I don't recommend using natural peanut butter (235g)
  • 1 cup light or dark brown sugar tightly packed (200g)
  • 1 cup granulated sugar 200g
  • 1 large egg + 1 large egg yolk
  • 1 1/2 teaspoons vanilla extract
  • 2 3/4 cups all-purpose flour 345g
  • 1/2 cup graham cracker crumbs 65g
  • 1 teaspoon baking powder
  • 1 teaspoon cornstarch
  • 1/2 teaspoon salt
  • 2 Tablespoons milk
  • 4 1.55 oz milk chocolate Hershey bars chopped into pieces*
  • 1 ½ cups mini marshmallows 72g

Instructions

  • Preheat oven to 350F (175C) and line a 13x9 metal pan with parchment paper or grease and flour the sides and bottom of the pan.
  • Combine butter, peanut butter, and sugar in a large bowl and use an electric mixer to beat until light, creamy and well-combined.
  • Add egg/egg yolk and vanilla extract, and stir well.
  • In a separate bowl, whisk together flour, graham cracker crumbs, baking powder, cornstarch, and salt.
  • Gradually, on low speed, add flour mixture to peanut butter mixture, pausing occasionally to scrape down sides of bowl.
  • Add milk and stir until combined.
  • Fold in chopped Hershey bars and mini marshmallows -- the batter will be thick (I broke a spatula stirring it so proceed with caution!).
  • Spread batter into prepared ban and bake on 350F (175C) for 25-28 minutes (toothpick inserted in center should come back mostly clean with only a few crumbs)
  • Allow to cool completely before cutting and serving.

Notes

*I usually stir 3 of the hershey bars into the batter and reserve one to press on top of the cookie dough once I've spread it into the pan -- I think it makes the bars look prettier but you can just throw them in the batter if you prefer!

Nutrition

Serving: 1square | Calories: 273kcal | Carbohydrates: 35g | Protein: 5g | Fat: 14g | Saturated Fat: 6g | Cholesterol: 29mg | Sodium: 117mg | Potassium: 121mg | Fiber: 1g | Sugar: 21g | Vitamin A: 247IU | Calcium: 28mg | Iron: 1mg
Tried this recipe?Mention @SugarSpun_Sam or tag #sugarspunrun!

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Peanut butter s\'mores bars

Filed Under: Cookies

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Comments

  1. Trish says

    August 13, 2020 at 10:08 am

    I want to start by saying I never comment on recipes, ever. I bake all the time, and have tried literally hundreds of recipes from Pinterest. I have to say there are no words to describe how delicious and easy these bars are. I made them for a coworker’s birthday, and will be making them again…and again…

    Reply
    • Sam says

      August 13, 2020 at 9:09 pm

      Thank you so much, Trish! I appreciate you taking the time to leave a comment. I’m so glad you enjoyed them so much. 🙂

      Reply
  2. nad says

    June 8, 2020 at 10:33 am

    good

    Reply
  3. Maricela says

    May 13, 2020 at 7:40 pm

    Hi Sam, wanted to ask if it’s okay to not incorporate the peanut butter in this recipe, my daughter is allergic. Is there a similar recipe and will it come out okay if I don’t use it? Thanks!

    Reply
    • Sugar Spun Run says

      May 14, 2020 at 12:26 pm

      Hi, Maricela! This recipe is a peanut butter cookies base so I do not reccomend it. I have a S’mores Cookies recipe that I would use instead. You can bake the dough into cookies or into cookie bars if you’d prefer. There is no peanut butter in that recipe. 🙂

      Reply
  4. Aticle says

    August 6, 2019 at 10:02 am

    sooo delicious can not stop eating it ,i made them for a project but i ate sooo much it remained only 2 but i got an A instead of an A* ,bummer,but i am still obsessed with it.*^_^*

    Reply
    • Sam says

      August 6, 2019 at 11:12 am

      😂 I’m so glad you enjoyed them! 🙂

      Reply
  5. Joanne J Woodman says

    August 29, 2018 at 6:44 am

    5 stars
    Sam,wow I made these for work. They couldn’t eat them fast enough. Great recipe. Thanks Joanne

    Reply
    • Sam says

      September 10, 2018 at 8:43 pm

      I am so glad everyone enjoyed them Joanne! Sounds like you’ll be the new favorite at work! 😉

      Reply
  6. Priscila says

    August 21, 2018 at 2:52 pm

    Just wondering, why not use natural peanut butter?

    Can’t wait to try making these!

    Reply
    • Sam says

      September 8, 2018 at 9:44 pm

      It could make them come out dry and crumbly.

      Reply
  7. Adelaide Gantt says

    August 20, 2018 at 11:32 am

    I am already a subscriber but do not have the cookie e-book.

    Reply
    • Sam says

      August 20, 2018 at 10:18 pm

      Hi Adelaide! I’m not sure why you didn’t get it when you subscribed, but I just e-mailed you the e-book!

      Reply

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The author (Sam) in blue shirt holding donut Hi, I'm Sam! I'm dedicated to bringing you sweet, simple, and from-scratch dessert recipes. My life may or may not be controlled by my sweet tooth. Send help (or chocolate). Read more about me.

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