- cooking spray
- 2 cups honey graham cereal (such as Golden Grahams®)
- 2 cups peanut butter corn puff cereal (such as Reese's Puffs®)
- 2 cups chocolate-covered toasted oat cereal (such as Chocolate Cheerios®)
- 40 marshmallows
- 1/4 cup butter
- Spray a 9×13-inch baking pan with cooking spray.
- Mix honey graham cereal, peanut butter cereal, and toasted oat cereal together in a bowl.
- Combine marshmallows and butter in a large pot over low heat; cook and stir until melted and smooth, 5 to 10 minutes. Pour over cereal mixture; stir until mixed.
- Pour cereal and marshmallow mixture into prepared baking pan. Spray hands with cooking spray; pat mixture down evenly.
- Let cool, about 10 minutes. Cut into squares.