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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 22 Comments

    This post may contain affiliate links. As an Amazon Associate I earn from qualifying purchases. Please read my disclosure policy.
    Jump to Recipe Print Recipe
    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 3 votes
    Print Pin Rate
    Course: cookie
    Cuisine: American
    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 ½ teaspoons vanilla extract
    • 2¾ cups all-purpose flour (345g)
    • ½ cup graham cracker crumbs (65g)
    • 1 teaspoon baking powder
    • 1 teaspoon cornstarch
    • ½ teaspoon salt
    • 2 Tablespoons milk
    • 4 1.55 oz milk chocolate Hershey bars chopped into pieces*
    • 1 ½ cups mini marshmallows (72g)
    Prevent your screen from going dark

    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

    Nutritional information is based on third-party calculations and should be considered an estimate only. Actual nutritional content will vary based upon brands used, measuring methods, cooking method, portion sizes, and more.

    Tried this recipe? Show me on Instagram!Mention @SugarSpun_Sam or tag #sugarspunrun!

     

    Peanut butter s\'mores bars

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    Reader Interactions

    Comments

    1. Sarah Eden Walker

      October 16, 2022 at 5:53 pm

      I think there might be a typo on your flour amount. 1 3/4 cup is NOT 345 grams. I went with the weight as that made more sense to me (since you said they were thick). They are in the oven now, and I can’t wait to try them!

      Reply
      • Sam

        October 17, 2022 at 9:43 pm

        Hi Sarah! I’m so sorry for the confusion! You are correct! It should read 2 3/4 cup of flour. I actually re-tested the recipe today to make sure the grams were correct (and they were). I have updated the post. Thank you so much for catching that. I hope you loved them! 🙂

        Reply
        • Sarah Eden Walker

          October 20, 2022 at 11:57 am

          They were a huge hit!

    2. Alison Jakubowski

      January 12, 2022 at 6:11 am

      This looks like an amazing recipe that I know my family will love! One question: could I use chocolate chips instead of broken Hershey bars and still have good results? I have lots left over from Christmas and would like to use them up. Love your recipes always a hit!

      Reply
      • Emily @ Sugar Spun Run

        January 12, 2022 at 9:55 am

        You sure can, Alison 😊 Enjoy!

        Reply
    3. Paige Larson

      November 26, 2021 at 2:53 am

      5 stars
      This turned out GREAT but I definitely needed to bake it so much longer then listed. So I did that the second time I made these. The first time they were underdone in the center, but some people like that.
      Not sure why it’s taking so long to bake? I use NordicWare 9X13 pan that I line with parchment. I only use this blog for all of my recipes…the one thing is that I cannot find mini marshmallows as in the type that you’ll find in hot cocoa packets which is the size that looks like is used in the pictures. I can only find the mini marshmallows that you’d add to your hot cocoa (like 1/4 of a traditional marshmallow) Wondering if that makes a bit of a difference since those are gooey-er in nature?

      Reply
      • Sam

        November 26, 2021 at 12:59 pm

        The bigger marshmallows could be causing them to be gooey-er for sure. It can be tough to find those mini dehydrated marshmallows. I can normally find them near the hot chocolate. I’m not sure why yours are taking longer to bake, but I’m glad you’ve got it figured out. 🙂

        Reply
    4. CM

      May 14, 2021 at 4:07 pm

      hi, how do we store this and how long does it last?

      Reply
      • Sam

        May 14, 2021 at 11:16 pm

        These will last for about a week at room temperature in an air tight container. 🙂

        Reply
    5. Trish

      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

        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
    6. nad

      June 08, 2020 at 10:33 am

      good

      Reply
    7. Maricela

      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

        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
    8. Aticle

      August 06, 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

        August 06, 2019 at 11:12 am

        😂 I’m so glad you enjoyed them! 🙂

        Reply
    9. Joanne J Woodman

      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

        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
    10. Priscila

      August 21, 2018 at 2:52 pm

      Just wondering, why not use natural peanut butter?

      Can’t wait to try making these!

      Reply
      • Sam

        September 08, 2018 at 9:44 pm

        It could make them come out dry and crumbly.

        Reply
    11. Adelaide Gantt

      August 20, 2018 at 11:32 am

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

      Reply
      • Sam

        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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