Square Cheerio cereal bar with M&Ms on a white plate

Cheerio and M&M Cereal Bars

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.

Course Breakfast, Snack
Cuisine American
Keyword Cereal bar
Prep Time 10 minutes
Cook Time 1 minute
Total Time 11 minutes
Servings 20 cereal bars
Calories 189 kcal
Author Jennifer @ Plowing Through Life


  • 10 ounces mini marshmallows
  • 3 tablespoons butter
  • 1/2 cup peanut butter
  • 5 cups Cheerios
  • 10 ounces M&Ms


  1. Place butter and marshmallows in a microwave-safe bowl; microwave for one minute.

  2. Quickly stir in peanut butter and remaining ingredients in the order listed.

  3. Add Cheerios and mix, then add M&Ms and mix.

  4. 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.

Recipe Notes