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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 189kcal
Author Jennifer @ Plowing Through Life


  • Measuring Cups
  • Silicone Spatula
  • 9x13 Baking Dish


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


  • 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.


  • Have all ingredients measured out before starting the microwave because the marshmallows will set up fairly quickly
  • We like to reserve a few M&Ms to sprinkle on top, but they must be added and pressed down quickly to stick
  • Regular or Honey Nut Cheerios work well in this recipe
  • Make sure cereal is fresh, I may have used slightly stale cereal before which makes the bars taste stale
  • All cooking appliances and conditions are different, so you should test these times and guidelines first in your own appliance to determine what adjustments may be needed!


Calories: 189kcal | Carbohydrates: 26g | Protein: 3g | Fat: 9g | Saturated Fat: 4g | Cholesterol: 7mg | Sodium: 96mg | Potassium: 76mg | Fiber: 1g | Sugar: 18g | Vitamin A: 257IU | Vitamin C: 1mg | Calcium: 41mg | Iron: 2mg