Easy Marshmallow Brownies

Chewy brownies with soft, sweet marshmallows topped with a rich chocolate, peanut butter layer with crispy rice cereal makes amazing Marshmallow Brownies!

This combination of chocolate and mini-marshmallows make an irresistible sweet treat.

Large piece of marshmallow brownie with layers of brownie, melted marshmallows and crunchy chocolate topping with a fork laying beside the piece in front of a dish full

If you like this brownie recipe you may also enjoy Texas Brownies, Chocolate Syrup Brownies, Triple Layer Browniesand our Big Batch of Brownies.

Marshmallow Brownies Recipe

These brownies are perfect dessert for birthday parties, Valentine’s Day, potlucks, carry-in meals or when you want show somebody they are special. I love that you can use a board scraper or butter knife to cut them into 1” squares or bigger pieces like you’d get a sweet shop.

Start with a family size brownie box mix, then top with marshmallows for a fun twist on a classic dessert recipes. The real magic is in the sweet and crunchy topping. Add a mixture of melted semi-sweet chocolate chips, peanut butter and Rice Krispie cereal.

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Chill and the layers in these beautiful brownies slice up so nicely to make the best marshmallow brownies recipe!

Stack of gooey marshmallow brownies on a red plate with creamy melted marshmallows showing between layers of chocolate

Everyone I’ve seen eat these Brownies with gooey marshmallows enjoys them.

Ingredients Needed:

  • Box of family size brownie mix
  • Vegetable oil
  • Water
  • Eggs
  • Mini marshmallows
  • Semi-sweet chocolate chips
  • Peanut butter
  • Butter
  • Rice Krispie cereal
Crispy rice cereal, mini marshmallows, semi-sweet chocolate chips, chewy fudge brownies, egg, peanut butter and oil on a brown wooden counter top

How to Make Marshmallow Brownies

  1. Preheat oven to 350 degrees F and grease bottom of 13 x 9-inch pan.
  2. Prepare and bake brownies following package directions for original recipe.
  3. Sprinkle marshmallows on hot brownies.  Bake for 3 minutes longer.
  4. Combine chocolate chips, peanut butter and butter in a medium saucepan.  Cook on low heat stirring constantly until chips are melted.
  5. Add rice cereal and mix well.
  6. Spread mixture over marshmallow layer.
  7. Refrigerate until chilled.  Cut into bars and enjoy!
Chocolaty marshmallow topping on box mix brownies in a glass baking dish on a red napkin

Step By Step Instructions

Mix up a box of your favorite brand of a family size brownie mix and bake until a toothpick comes out clean.

Take care not to over stir or over bake.

Eggs and vegetable oil in a mixing bowl with a box of brownie mix

Then sprinkle a bag of mini marshmallows evenly over the top.

Mini marshmallows on top of a 9 x 13" pan of brownies

Bake for 3 minutes until marshmallows look a bit melty.

Lightly melted layer of marshmallow brownie topping on baked brownies

Allow pan to cool for at least 20 – 30 minutes. The pan will cool faster when removed from the top of the hot oven.

To make the scotcheroo style topping combine chocolate chips, peanut butter and butter in a microwave safe baking dish.

Glass bowl of semi-sweet chocolate chips with butter and peanut butter on top

Stir every 30 seconds. I like to use a silicone spatula.

Partially melted chocolate chips stirred together with softened peanut butter in a glass bowl

Or cook on low heat in a medium saucepan stirring constantly until chips are melted. 

Add rice cereal and mix well. 

Melted chocolate and peanut butter with a spatula stirring in rice crispy cereal

Spread mixture over marshmallow layer.

Spooning works best, but pouring is an option if you’re in a hurry and are a less detail oriented person.

Melted chocolate and peanut butter mixture with Rice Krispies spread over top of marshmallow brownies

Some of the marshmallows rise up through the topping making random patterns or swirls in the topping that tastes so yummy!

Refrigerate until chilled. Then cut and serve.

Delicious layers of chocolate topping on melted creamy marshmallows on a fudgy chocolate brownie

Store covered in an airtight container in a cool place.

Recipe Tips & Tricks

  • Use fresh marshmallows for best results.
  • Can spread a layer of marshmallow creme over baked brownies and bake for 2 minutes as a substitute.
  • Allow marshmallow layer to cool before adding melted chocolate on top or the marshmallows will deflate quite a bit.
  • Spoon Chocolate over the top for more even distribution than pouring.
  • Take care not to burn the brownies – we have a convection oven and that can make brownies, cakes, and cookies bake more quickly.
  • Should the Gooey Marshmallow Brownies get transported or covered with an airtight lid before cooling, the marshmallows will bubble up through the top chocolate layer and give the dessert a marbled look.  If you take plenty of time and allow everything to cool and release steam and keep the dish level the top layer will remain an even layer of chocolate.
Fork full of gooey marshmallow brownie with marshmallow stretching across the white plate

How to Keep Brownies From Falling Apart

Gooey Marshmallow Brownies slice easiest when chilled and using a serrated knife or a board scraper.  As the brownies get to room temperature they are more likely to crumble and begin to fall apart.

We like this recipe chilled and we like how it gets gooier as it warms up.  The perfect example of a winning recipe is that it tastes good in any situation!

Chocolate Marshmallow Brownies on a red napkin with toddler hand reaching for brownies

I have an assistant that was cheering wildly for this recipe during our photo session.  She has taught me to take pictures faster because she loves sampling everything chocolate!  Her hands kept edging closer to the pan as she was saying “Chocolate.  Chocolate. Chocolate.”  Before she even tasted the recipe she knew how to describe it 🙂

Other rich desserts in a 13 x 9-inch pan that our family enjoys

Printable Gooey Marshmallow Brownies Recipe

Stack of Gooey Chocolate Marshmallow Brownies on a red plate

Gooey Marshmallow Brownies

Servings 20 brownies
Jennifer @ Plowing Through Life
Chewy brownies with soft, sweet marshmallows topped with a rich chocolate, peanut butter layer with crispy rice cereal makes amazing Marshmallow Brownies!
5 from 1 vote
Prep Time 15 minutes
Cook Time 30 minutes
Refrigerate until chilled 2 hours
Total Time 2 hours 45 minutes

Ingredients
  

Brownies

  • 18.3 ounces brownie mix family size
  • 2 eggs
  • 1/2 cup vegetable oil
  • 1/4 cup water

Marshmallow Layer

  • 10 ounces mini marshmallows

Chocolate Topping

  • 1 1/2 cups semi-sweet chocolate chips
  • 1 cup creamy peanut butter
  • 1 tablespoon butter
  • 1 1/2 cups crispy rice cereal

Instructions
 

Brownies

  • Preheat oven to 350 degrees.  Grease bottom of 13 x 9-inch pan.  Prepare and bake brownies following package directions for original recipe.  

Marshmallow Layer

  • Sprinkle marshmallows on hot brownies.  Bake for 3 minutes longer.
  • Allow marshmallows to cool for 20 – 30 minutes before adding the final layer.

Chocolate Topping

  • Combine chocolate chips, peanut butter and butter in medium sauce pan.  Cook on low heat stirring constantly until chips are melted. 
  • Add rice cereal and mix well.  Spread mixture over marshmallow layer.  Refrigerate until chilled.  Cut into bars and enjoy!

Nutrition

Calories: 379kcalCarbohydrates: 43gProtein: 6gFat: 21gSaturated Fat: 6gPolyunsaturated Fat: 5gMonounsaturated Fat: 8gTrans Fat: 0.1gCholesterol: 19mgSodium: 155mgPotassium: 158mgFiber: 2gSugar: 27gVitamin A: 48IUCalcium: 18mgIron: 2mg

Nutritional Disclaimer

“Plowing Through Life” is not a dietitian or nutrition professional. Any nutritional information shared is an estimate and can vary greatly depending on specific products are used. If calorie count and other nutritional values are important to you, we recommend running the ingredients through an online nutritional calculator of your choice.

Tried this recipe?Mention @PlowingThroughLife or tag #PlowingThroughLife!

Originally shared April 18, 2019 with pictures updated on January 31, 2023.

One Comment

  1. Rosemarie says:

    5 stars
    Items continue to bake for between 5 – 10 after being taken out of the oven

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