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Cheerio cereal bars in a baking tray next to two boxes of cheerios cereal

Cheerio Cereal Bar Recipe

Cheerio bars with marshmallows are so easy to make, and the result is an ooey, gooey favorite I just can’t get enough of. I know you’ll love this cereal bar recipe as much as I do!
Course Dessert or snack
Cuisine American
Keyword cereal bar recipe, cereal bars recipe, cheerio bars, homemade cereal bars, how to make cereal bars
Prep Time 3 minutes
Cook Time 2 minutes
Total Time 5 minutes
Servings 12
Calories 138kcal


  • 3 Tbsp. butter
  • 10 ½ oz. bag of marshmallows miniature or full-size, about 6 cups
  • 5 cups Cheerios cereal
  • Optional: Valentine's Day sprinkles


  • Butter (or use cooking spray) a large, microwave-safe bowl.
  • Microwave 3 Tbsp. of butter with one 10 ½ oz. bag of miniature or full-size marshmallows for 1 minute on high. Remove from microwave, stir, and microwave again for an additional minute. Stir until smooth.
  • Gradually stir in 5 cups of Cheerios cereal. Fold in until the cereal is evenly mixed with the marshmallows.
  • Butter a 9 x 13″ baking pan.
  • Using your hands, the back of a spoon, or a rubber spatula, press the mixture into the baking pan. Allow to cool completely, then cut into bars.



  • Add sprinkles while still warm: If adding toppings like sprinkles, make sure to add them while the mixture is still sticky! Otherwise, they will not stick.
  • Let it harden before cuttingLet the mixture cool off in the pan before cutting into it for clean, even cuts.


Calories: 138kcal | Carbohydrates: 27g | Protein: 2g | Fat: 4g | Saturated Fat: 2g | Cholesterol: 8mg | Sodium: 97mg | Potassium: 56mg | Fiber: 1g | Sugar: 15g | Vitamin A: 381IU | Vitamin C: 2mg | Calcium: 36mg | Iron: 3mg