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+ servings

Monster Marshmallow Cereal Treats

Let your creative side run wild with these easy to make Monster Marshmallow Cereal Treats! 

Yield: 8-inch square pan

Course Dessert
Servings 6 servings
Author Maryanne Cabrera


  • 6 Tablespoon (85 g) unsalted butter
  • 10 oz bag small marshmallows
  • 1/4 teaspoon kosher salt
  • 5 cups cereal of choice, or assorted cereals*
  • 3 Tablespoons festive nonpareils (sprinkles), optional


  • 1/2 cup (113 g ) unsalted butter, room temp, softened
  • 2 cups (227 g) powdered sugar
  • 2 Tablespoon milk, or heavy cream
  • 1 teaspoon vanilla
  • pinch kosher salt
  • food coloring, as desired


  • assorted sprinkles
  • candy eyes
  • mini candy corn
  • black gel icing


  1. Line an 8-inch square baking pan with parchment paper, allowing excess paper to hang over the sides. This will help in unmolding the marshmallow treats. Set aside.

  2. In a large sauce pot, melt butter over medium heat. (*IF desired, brown melted butter.) Add marshmallows and salt. Stir to combine until marshmallows are smooth and melted. Remove from heat.

  3. Add in cereal. Gently fold to combine until cereal is completed coated in marshmallow. Add sprinkles, if desired. Stir until well distributed.

  4. Transfer marshmallow cereal mixture to prepared baking pan. Press mixture into an even layer. Allow to cool to room temperature.

  5. Unmold cereal treats from pan. Slice into 6 equal rectangles, or desired serving sizes. Decorate with frosting, sprinkles, and candies as desired.


  1. In the bowl of a stand mixer fitted with paddle attachment (or using an electric hand mixer, beat butter until creamy. With the mixer running on low, gradually add powdered sugar. Add milk, vanilla, and salt. Beat until well combined.

  2. Divide frosting into three bowls. Add gel paste food coloring as desired.

Recipe Notes

  • I used a combination of Rice Krispies (toasted rice cereal), Kix, and Cap'n Crunch cereals. Other cereals to consider: Fruit Loops, Apple Jacks, Cherrios, Trix.
  • Frosting is enough for two 8-inch square pans. 


  • Frosted marshmallow cereal treats will keep well in an airtight container at room temperature for up to 3 days.