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5 from 4 votes

Chocolate Marshmallow Sheet Brownies

These soft and buttery homemade brownies are topped with gooey marshmallows and a delicious from-scratch chocolate frosting. It's the perfect dessert to feed to a large crowd!
Servings: 24 servings
Author: The Craft Patch www.thecraftpatchblog.com

Ingredients

Cream together:

  • 1 cup butter or margarine softened
  • 1/2 cup cocoa powder
  • 2 cups sugar

Add:

  • 4 eggs
  • 1 1/2 cups flour
  • 1/2 teaspoon salt
  • 2 teaspoons vanilla

Top With:

  • 16 ounces mini marshmallows (one bag)

Frosting Option 1: Chocolate Buttercream

  • 1/2 cup butter
  • 1 2/3 cups powdered sugar
  • 1/3 cup cocoa powder
  • 1/3 cup evaporated milk (regular milk works too)

Frosting Option 2: Chocolate Ganache

  • 2 cups chocolate chips
  • 2 cups heavy cream

Instructions

  • Cream together butter, cocoa powder and sugar. Then add eggs, flour salt and vanilla. Mix until smooth, then spread on a greased sheet pan. 
  • Bake at 350 degrees for 20 minutes or until a toothpick inserted in the center comes out clean. Immediately sprinkle with one package miniature marshmallows. Return to oven for 3 minutes. Cool for one hour.
  • For Chocolate Buttercream Frosting: Whip all ingredients until smooth.
  • For Chocolate Ganache Frosting: Gently warm heavy cream, then add chocolate chips and stir until melted and smooth. Refrigerate mixture until cold (at least two hours), then whip in a mixer with the whisk attachment until firm and fluffy.
  • Spread frosting carefully over the marshmallow layer of the brownies. Cut into squares with a hot knife. Cover any leftovers tightly so they don't dry out.