These Cheerio Treats are an easy no-bake recipe with cheerios, marshmallows, peanut butter, and M&Ms.
Place butter and marshmallows in a large microwave-safe bowl.
Microwave for 1-2 minutes or until ready to stir. Stir in peanut butter until blended.
Stir in the cereal and M&M's. Spoon into a greased 9x13 pan and press down gently. Let cool and then cut into squares.
Source: taste of home