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    Home » Recipes » Brownies

    Peanut Butter Marshmallow Brownies

    Published: May 14, 2021 · Modified: Mar 23, 2023 by brooke · This post may contain affiliate links · 8 Comments

    164 shares
    Jump to Recipe

    These peanut butter marshmallow brownies are a thick brownie topped with peanut butter, gooey marshmallows and a sweet chocolate frosting. The ultimate dessert.

    peanut butter marshmallow brownies stacked in pairs

    WHY YOU NEED TO MAKE THESE PEANUT BUTTER MARSHMALLOW BROWNIES

    Brownies are the ultimate crowd pleasing dessert. And when you add peanut butter and marshmallows to them they are next level good. These brownies can be made in less than an hour, and can be cut bite size if you want to serve them to a group.

    You could easily make these with a bowl and a spoon if wanted. No kitchen-aid or other mixer required.

    These freeze perfectly, so you can make them ahead of time, or keep individuals in little baggies for whenever you need a little treat!

    full pan of brownies cut on parchment paper.

    WHAT KITCHEN TOOLS YOU WILL NEED:

    • 8X8 baking pan. Although you could also double and put in a 9x13.
    • Parchment paper. This makes it really easy to remove the brownies from the pan after cooled.
    • 3 Mixing Bowls. One to whisk dry ingredients, one for the brownie batter, and one for mixing the frosting.
    • Small saucepan. You will need this to melt butter, cocoa powder and milk for the frosting.
    • Spatulas and Whisks. This will definitely help with mixing and pouring into the pan
    • Knife. A sharp large knife to cut the cooled and chilled brownies. If you run your knife in hot water between cuts it will guarantee a smooth cut every time!
    6 brownies scattered with cocoa powder in the background

    HOW TO MAKE PEANUT BUTTER MARSHMALLOW BROWNIES

    One of the reasons I always love making brownies and taking them places is because they are so easy to make. You can use a mixer if you have one, but it isn't necessary.

    1. Preheat oven to 350 F. Line an 8x8 baking pan with cookie spray and parchment paper.
    2. In a small bowl whisk together cocoa powder, flour and salt. Set aside.
    3. In a medium mixing bowl beat together butter and sugar until light anf fluffy.
    4. Add eggs one at a time, and then vanilla. Beat until combined.
    5. Stir dry ingredients in until incorporated.
    6. Spread evenly into baking pan. Sprinkle with chocolate chips. Bake for 22-25 minutes, or until done.
    7. As soon as brownies are done baking, warm peanut butter in the microwave for about 15 seconds to melt and make pourable. Spread over freshly baked hot brownies. Top with marshmallows and return to the oven for another 3-5 minutes until puffy. Remove and allow to cool.
    8. Make frosting while brownies are cooling; In a small saucepan melt butter. Once melted, add 2 tablespoon cocoa powder and ¼ cup milk and stir until boiling. Once boiling, remove from heat and pour into a mixing bowl. Add powdered sugar and salt and beat until smooth and glossy. Add vanilla and combine. Pour over cooled brownies. They don't have to be completey cool, but you don't want to frosting to melt.
    9. Chill in the refrigerator for an hour or more to set up.
    straight picture of brownies to see different layers of peanut butter, marshmallows and frosting

    CAN I USE CREAMY PEANUT BUTTER INSTEAD OF CRUNCHY

    Absolutely! I love having the little chunks of peanuts in these, but either works great.

    CAN I MELT BUTTER, COCOA POWDER AND MILK IN THE MICROWAVE

    Yes you can. I did try this so that I could see if it would work. Melt the butter first for about 30-45 seconds at a lower power level, once melted add cocoa powder and milk and microwave again for about 15 seconds to make sure its all warm and mixed together well. You don't want any cocoa powder clumps.

    cut peanut butter marshmallow brownies in rows with one turned to see inside

    If you're looking for a stand alone brownie recipe that's fudgy and sweet these Double Fudge Brownies are perfect for that!

    For more yummy treats follow me on instagram @thesaltedsweets. And be sure to tag me and comment below if you make them and love them as much as I do.

    peanut butter marshmallow brownies stacked in pairs.

    Peanut Butter Marshmallow Brownies

    brooke
    These peanut butter marshmallow brownies are a thick brownie topped with peanut butter, gooey marshmallows and a sweet chocolate frosting. The ultimate dessert.
    5 from 4 votes
    Print Recipe Pin Recipe
    Prep Time 15 minutes mins
    Cook Time 25 minutes mins
    1 hour hr
    Course Dessert
    Cuisine American
    Servings 16
    Calories 306 kcal

    Ingredients
     
     

    • 3 tablespoon cocoa powder
    • ½ teaspoon salt
    • ¾ cup all-purpose flour
    • ½ cup butter room temperature
    • 1 cup granulated sugar
    • 2 large eggs room temperature
    • 1 teaspoon vanilla
    • ½ cup chocolate chips
    • ½ cup crunchy peanut butter
    • 2 cups mini marshmallows
    • ¼ cup butter
    • 2 tablespoon cocoa powder
    • ¼ cup milk
    • 2 cups powdered sugar
    • ¼ teaspoon salt
    • ½ teaspoon vanilla

    Instructions
     

    • Preheat oven to 350 F. Line an 8x8 baking pan with cookie spray and parchment paper.
    • In a small bowl whisk together cocoa powder, flour and salt. Set aside.
    • In a medium mixing bowl beat together butter and sugar until light anf fluffy.
    • Add eggs one at a time, and then vanilla. Beat until combined.
    • Stir dry ingredients in until incorporated.
    • Spread evenly into baking pan. Sprinkle with chocolate chips. Bake for 22-25 minutes, or until done.
    • As soon as brownies are done baking, warm peanut butter in the microwave for about 15 seconds to melt and make pourable. Spread over freshly baked hot brownies. Top with marshmallows and return to the oven for another 3-5 minutes until puffy. Remove and allow to cool.
    • While brownies are cooling make the chocolate frosting.
      In a small saucepan melt butter. Once melted, add 2 tablespoon cocoa powder and ¼ cup milk and stir until boiling. Once boiling, remove from heat and pour into a mixing bowl. Add powdered sugar and salt and beat until smooth and glossy. Add vanilla and combine. Pour over cooled brownies. They don't have to be completey cool, but you don't want to frosting to melt.
    • Chill in the refrigerator for an hour or more to set up.

    Notes

    You can use creamy peanut butter if you prefer for these. I just like having the texture of the peanuts.
    I have given both cups and grams as measurements. Grams will be more precise, especially when measuring flour. If you don’t have a kitchen scale, no problem! Just lightly spoon flour into your measuring cup to insure its not packed in there. Light and fluffy is the key.

    Nutrition

    Calories: 306kcalCarbohydrates: 42gProtein: 4gFat: 15gSaturated Fat: 7gPolyunsaturated Fat: 2gMonounsaturated Fat: 4gTrans Fat: 1gCholesterol: 48mgSodium: 242mgPotassium: 108mgFiber: 1gSugar: 34gVitamin A: 306IUCalcium: 17mgIron: 1mg
    Keyword brownies, chocolate, marshmallows, peanut butter
    Tried this recipe?Let us know how it was!

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    Reader Interactions

    Comments

    1. Nicole

      November 07, 2021 at 4:46 pm

      5 stars
      So good! I’m not usually a marshmallow fan but these were perfection.

      Reply
      • brooke

        November 07, 2021 at 5:23 pm

        So glad you tried them even though you don't love marshmallows! Thanks for taking the time to leave a rating and review!

        Reply
      • Jenn

        October 10, 2022 at 5:50 pm

        Looking forward to trying these for a Halloween party. If I double the recipe, what size pan should be used?

        Reply
        • brooke

          October 10, 2022 at 8:02 pm

          Yay! A 9x13 will be perfect. You'll just need to add a few minutes onto your baking time for the brownie layer.

          Reply
    2. Lindsay

      November 07, 2021 at 8:41 pm

      5 stars
      This flavor combo was spot on! I can’t wait to make them again!

      Reply
    3. Kay

      November 28, 2021 at 2:23 pm

      5 stars
      Made this recipe 4 times this summer. We couldn't get enough of them. So rich and chewy, the peanut butter added so much flavor that we kept coming back for more.

      Reply
    4. Kate

      February 03, 2022 at 1:26 am

      5 stars
      Made this for my coworkers and they LOVED them! They still rave about these brownies and request them frequently. Thanks for creating the ultimate treat!!!

      Reply
      • brooke

        February 03, 2022 at 12:06 pm

        I'm so glad they were a hit! Thank you so much for trying them!

        Reply

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