How To Make Frosted Marshmallow Brownies

These yummy frosted marshmallow brownies are so fudgy, gooey, and chocolatey, you might just want to eat them with a fork!

Thanks so much for stopping buy! I know you came for the recipe, but I hope you don’t mind me sharing a bit about my inspiration for these marshmallow brownies, as well as a few tips and photos to make it easy for you to make them yourself!

Years ago a local ice cream shop had marshmallow sundaes on their menu. It was my go-to order whenever we would stop in. Simple soft serve vanilla with a smooth melted marshmallow topping. Hold the whip cream for me. Instead I asked for chocolate sauce on top!

Overhead view of frosted chocolate marshmallow brownies

That combination of chocolate and melted marshmallow! I really could have skipped the ice cream altogether!

These rich chocolate marshmallow brownies are reminiscent of that favourite summertime treat! Especially if you serve them with a scope of vanilla ice cream!

This post contains affiliate links to make it easy to find the products I use. Should you choose to make a purchase through an affiliate link, I may earn a small commission with no increase in cost to you!

a platter of chocolate frosted marshmallow brownies

I love recipes that don’t require a mixer. There is something therapeutic about whisking and stirring together a batter, and watching it come together perfectly. But, feel free to use a mixer if you prefer.

What you will need to make brownies

Why you will love this recipe

  1. No mixer required
  2. Freeze well
  3. Cut large for dessert or small for a snack
  4. Served with vanilla ice cream they make an extra special decadent dessert
  5. Simple ingredients that you likely already have in your pantry
Fudgey marshmallow brownies on a wood board

How to make Frosted Marshmallow Brownies

Step One – Combine melted butter and cocoa powder. Stir until smooth.

melted butter and cocoa in a clear mixing bowl
chocolate base for brownies made by whisking melted butter and cocoa powder

Step Two – Add sugar and stir until well combined. Mixture will be thick, so a wooden spoon works best.

Sugar added to melted butter and chocolate for marshmallow brownies

Step Three – Add eggs and vanilla and whisk until smooth.

Eggs added to brownie batter in a clear glass mixing bowl
Brownie batter before adding flour

Step Four. – Whisk together flour, baking powder and salt. Add to cocoa mixture and whisk until smooth and well combined. Add chopped nuts if you are using and stir well.

flour and baking powder being whisked into cocoa mixture for brownies
chopped walnut stirred into brownie batter

Step Five. – Pour into parchment lined baking pan and bake at 375 for 35 minutes.

brownie batter in a parchment lined square baking pan as the base for marshmallow brownies

Step Six – remove from oven and top with 19 regular marshmallows cut in half (top to bottom), return to oven for 3 minutes to allow marshmallows to melt (don’t let marshmallows brown)

marshmallows layered on top of brownie batter before baking

Step Seven – remove from oven and using a fork or offset spatula, squeeze down marshmallows to close any gaps, and allow to cool completely

marshmallows melted on top of brownie base

Frost – combine all frosting ingredients and whisk until smooth, pour over cooled marshmallows and spread with an offset spatula. Refrigerate until frosting is set.

icing sugar sifted into melted butter and cocoa powder for marshmallow brownie frosting
an off-set spatula is used to frost brownies

Tips to make these easy peasy

  • have all ingredients measured and ready to go before you begin
  • use clean kitchen scissors sprayed with non-stick spray to make cutting marshmallows a breeze
  • allow parchment to come up over edges of pan to easily lift prepared brownies out of the pan for cutting
  • for clean cuts, run a large chef’s knife under hot water and quickly dry before each cut
  • for large dessert brownies cut until 16 squares or for snack size cut into 32 small squares
fudge frosting on top of brownies with marshmallows

Who doesn’t love a fudgey, gooey brownie?! Nobody I know that’s for sure!

Why not bake up a batch of these rich, chocolatey marshmallow brownies? Whether for an after school snack or a decadent dessert, this will quickly become a family favourite!

And, if you ever come across a marshmallow sundae on the menu, trust me, ask to top it with chocolate sauce and hold the whipped cream! You can thank me later!


Other sweet squares you might enjoy…

Easy Chocolate Chip Cheesecake Bars

Coconut Key Lime Napoleon Squares

Blueberry Crumble Cheesecake Bars

Fudgey marshmallow brownies on a wood board

Frosted Marshmallow Brownies

Yield: 16-32
Prep Time: 15 minutes
Cook Time: 38 minutes
Total Time: 53 minutes

These yummy frosted marshmallow brownies are so fudgy, gooey, and chocolatey, you might just want to eat them with a fork!


  • 1/3 cup butter, melted
  • 2 tablespoons cocoa powder
  • 1 cup sugar
  • 2 eggs
  • 1 teaspoon vanilla extract
  • 3/4 cup all purpose flour
  • 1/2 teaspoon baking powder
  • 1/8 teaspoon salt
  • 1/2 cup chopped walnuts (optional)
  • 19 regular white marshmallows cut in half top to bottom
  • For Frosting
  • 2 tablespoons cocoa powder
  • 1 tablespoon butter
  • 1 1/2 cups sifting icing sugar
  • just a splash of milk to moisten


  1. Preheat oven to 375 degrees and line an 8 inch square pan with parchment paper
  2. In a large mixing bowl whisk together melted butter and cocoa powder until smooth.
  3. Stir in sugar using a wooden spoon. Mixture will be thick
  4. Add eggs and vanilla, and whisk until well combined and smooth
  5. Whisk or sift together flour, baking powder and salt. Add to chocolate mixture and whisk to combine.
  6. Stir in nuts if using
  7. Bake at 375 degrees for 25 minutes. Remove from oven and arrange marshmallow halves to cover the brownie base. Return to oven for 3 minutes, then remove from oven and using a fork, gently squeeze down marshmallows. Set aside to cool completely
  8. Combine frosting ingredients and using an offset spatula, smooth frosting over the cooled marshmallow brownies. Refridgerate to firm up frosting.
  9. Cut into equal size squares. 16 large squares or 24-32 small squares for snack size


Use a chef's knife heated under hot water for a nice clean cut

Serve with vanilla ice cream for a decadent dessert

Similar Posts

Leave a Reply

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


  1. I’m sharing this recipe with my daughter right now. She’s the bakers, pudding maker in our house 😉 and I need to taste this gooey yumminess. It sounds so delicious