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5 from 1 vote

Cornflake Chocolate Marshmallow Bars

Cornflake Chocolate Marshmallow Bars are layered bars that start with a cornflake crunch bar topped with chocolate, marshmallows, and another layer of cornflake bars.
Course: Dessert, Snack
Cuisine: American
Keyword: Cornflake Chocolate Marshmallow Bars
Servings: 12
Calories: 492kcal
Author: Amanda Rettke--iambaker.net


Cornflake Crunch

  • 4 cups cornflake cereal, roughly crushed
  • cup powdered milk
  • 2 tablespoons granulated sugar
  • 1 teaspoon kosher salt
  • ½ cup (1 stick or 113g) butter, melted


  • 1 cup (2 sticks or 227g) butter, softened
  • cups (250g) granulated sugar
  • cup (133g) brown sugar
  • 1 large egg, room temperature
  • ½ teaspoon vanilla
  • cups (187.5g) all-purpose flour, plus 2 tablespoons
  • 1 cup (127g) bread flour
  • ½ teaspoon baking soda
  • ½ teaspoon baking powder
  • teaspoons kosher salt
  • 2 cups mini marshmallows
  • 5 chocolate (1.55 ounces each) Hershey bars


Cornflake Crunch

  • Preheat oven to 275°F and line a baking sheet with parchment paper.
  • In a medium bowl add crushed cornflakes, powdered milk, sugar, and salt. Toss to combine.
  • Pour in the melted butter and toss again. (Small cornflake clusters will form).
  • Pour the mixture onto the baking sheet and bake for 20 minutes (or until the cereal is slightly toasted).
  • Cool completely. Then, break up any large clusters into bits.


  • Preheat oven to 350°F and spray a 9x13-inch pan with nonstick cooking spray.
  • In the bowl of a stand mixer, add butter, granulated sugar, and brown sugar. Mix on medium until creamy (about 2 minutes).
  • Add egg and vanilla and continue mixing for 8 minutes. (Yes, 8 minutes, to aerate the dough.)
  • Add all-purpose flour, bread flour, baking soda, baking powder, and salt and mix on low until just incorporated.
  • Gently fold in the cooled cornflake crunch.
  • Divide dough in half and place half into the base of the 9x13-inch pan. Press down into an even layer.
  • Top with Hershey bars and mini marshmallows.
  • Top with the other half of dough in an even layer (all the way to the edges).
  • Bake for 25-30 minutes, or until golden brown.
  • Let the bars cool before serving.


Calories: 492kcal