Our family loves dressing up classic Cheerios cereal with M&Ms, peanut butter and marshmallows to make super easy Cheerio and M&M Cereal Bars! Cereal bars are perfect for breakfast and snacks.
Place butter and marshmallows in a microwave-safe bowl; microwave for one minute.
Quickly stir in peanut butter and remaining ingredients in the order listed.
Add Cheerios and mix, then add M&Ms and mix.
Use wet fingers to press into a greased 9 x 13 pan. Sprinkle a few M&Ms on top and press into cereal bar mixture if desired.