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M&M Cheerio Bars

These M&M Cheerio bars are colorful, fun, and absolutely delicious! I also love the fact that these Cheerio treats are easy to make and a great activity to do with the kids.

M&M cheerio bar on a plate

These Cheerios bars are a great party food, especially if it’s for kids. The colorful candies add such a nice festive touch the little ones will love. Plus it’s a great treat that does well in bake sales.

Peanut Butter Cheerio Bars

This time, I used regular Cheerios, but it’s also delicious with Honey Nut Cheerios. Of course, the results will be sweeter, but that’s a good thing, right?

After making various Rice Krispie Treats, I thought it would be fun to make something with a different cereal mixture. If you have a box of Cheerios, you’re already off to a great start!

Although I probably wouldn’t give these to my children or grandchildren for breakfast every morning, it’s a fun breakfast food for sleepovers and other special occasions. Offer it with a variety of other breakfast foods, including sausage patties, crispy bacon, fruit and yogurt parfaits, and eggs.


There’s a good chance you have the ingredients to make this yummy recipe. Check your pantry before you go to the store for any of it.

large box of cheerios

Here is what you’ll need to make them the way I have them here:

  • Cheerios
  • Mini marshmallows
  • Creamy peanut butter
  • Regular M&Ms
  • Butter
jar of peanut butter and stick of butter

For exact measurements of each ingredient and full directions, go to the recipe card at the bottom of the page. You can even print out the card by using the “print” button.

pack of mini marshmallows and bowl of M&Ms

You can swap out some of the ingredients or add other things to this simple recipe. In fact, some of the M&Ms fell off the top of these bars, so I drizzled some light corn syrup over the top in those places. You can also melt more marshmallows and use the gooey mixture to stick the M&Ms back on.

Here are some other things you can add:

  • Dark or milk chocolate chips
  • White chocolate chips
  • Almond butter (in place of the peanut butter)
  • Fruity Pebbles
  • Pretzel pieces
  • Chocolate candies
  • Any of your favorite candies
  • Brown sugar
  • Vanilla extract
  • Reeses Pieces


Spray a 7” x 11” or 8” x 8” pan with non stick spray. Normally, I use an 8 inch square baking dish, but this time I used a rectangular one. You can use a greased 13-in pan if you double the recipe.

Set it aside while you get everything else ready.

You’ll also need a large bowl (large microwave-safe bowl), a spoon, and a spatula.

How to Make M&M Cheerio Bars

Combine the butter and marshmallows in the large bowl.

butter and marshmallows in a bowl

Microwave this until both ingredients are melted.

Stir until they are smooth and blended.

melted butter and marshmallows

Next, add the peanut butter and stir the mixture until it is well blended.

peanut butter in bowl with melted marshmallows and butter
blended peanut butter and marshmallow mixture

Carefully fold in the Cheerios until they are coated. Add the M&Ms and fold them into the mixture. Even though I was careful, I still broke a couple of the M&Ms, but that’s okay. It’s still good.

cheerios stirred into marshmallow and peanut butter mixture

Using a spatula, spread the mixture into the greased pan. Since the Cheerio and sugar mixture is so sticky, you may want to spray the spatula with nonstick cooking spray first.

M&M Cheerio mixture pressed into a pan

With greased hands or with the back of the spatula, gently press the mixture until it is even. Try not to crush the Cheerios. But if a few of them break, that’s okay.

Now it’s time to let it set. You can either put it in the refrigerator for a half hour or allow it to set at room temperature for an hour.

With a greased knife, cut it into square or rectangular bars. I typically get 15 or 16 bars out of this easy recipe.

pan and plates of M&M cheerio bars

More Cereal Treat Bars

There are so many different easy no bake treats that you can make with a variety of cereals. These M&M Cheerio bars are one of many types that the family will enjoy.

Crisped rice (Rice Krispies) are super popular. You can also use Chex as well different varieties of Cheerios.

Here are some we enjoy:

Peanut Butter Cocoa Krispie Treats – Peanut butter and chocolate lovers rejoice! This blend of flavors will send your tastebuds into orbit!

Brown Butter Rice Krispie Treats – There’s something about brown butter that makes these Rice Krispie treats from Southern Bite even more special.

Microwave Scotcheroos – When you’re in the mood for a delicious, crunchy, chocolate treat, make these amazing scotcheroos.

Gooey Chocolate Chex Bars – Ooey gooey, and oh-so delicious, these chocolate Chex bars will win you some points with family and friends … that is, if you decide to share.

Yield: 15 bars

M&M Cheerio Bars

M&M cheerio bar on a plate

Make a batch of delicious and fun M&M Cheerio bars from a few simple ingredients. They're fun and delicious!

Prep Time 5 minutes
Cook Time 5 minutes
Additional Time 30 minutes
Total Time 40 minutes


  • 3 cups Cheerios cereal
  • 2 cups mini marshmallows
  • 1/3 cup creamy peanut butter
  • 1/2 cup regular M&Ms
  • 2 tablespoons butter


  1. Spray a 7” x 11” or 8” x 8” pan with nonstick cooking spray. Set it aside.
  2. In a large mixing bowl, microwave the butter and marshmallows until they are melted. Mix until they are blended and smooth.
  3. Add the peanut butter and stir until blended.
  4. Carefully fold in the cheerios until they are coated. Add the M&Ms and fold them into the mixture.
  5. Spread the mixture into the greased pan. Gently press the mixture until it is even. Be careful not to break the Cheerios.
  6. Cool at room temperature.
  7. Cut into 15 square or rectangular pieces.


If the M&Ms are loose, you can drizzle more melted marshmallows or a very small amount of corn syrup over the top.

Or you can dip the M&Ms into the melted marshmallows and stick them back onto the bars. It doesn’t take much to keep them on.

Nutrition Information



Serving Size


Amount Per Serving Calories 123Total Fat 6gSaturated Fat 3gTrans Fat 0gUnsaturated Fat 3gCholesterol 5mgSodium 77mgCarbohydrates 16gFiber 1gSugar 9gProtein 2g

The nutrition information is a product of online calculators. I try to provide true and accurate information, but these numbers are estimates.

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