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Colorful M&M Rice Krispie Treats

By Marley Goldin
on September 9, 2021
5 from 2 votes

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These M&M Rice Krispie Treats are the most colorful, fun, and sticky-sweet way to treat yourself, without ever turning on the oven!
m&m's rice krispie treats

Looking for an ooey-gooey treat to munch on for a sweet fix? These M&M Rice Krispie Treats are the perfect balance of crunchy, sticky, sweet, and chocolate!

A nostalgic treat with the addition of classic candy-coated chocolate M&M’s makes for a new twist on the humble Rice Krispie Treat.

grabbing an m&m rice krispie treat to eat

As an environmental scientist, I am always trying to find ways to combat food waste, and cereal is one of those things I buy on sale, thinking they’ll be a great solution to busy mornings, but then forget about the box in the back of the pantry.

But when you add marshmallows and butter and candy-coated chocolate, you better believe no one in my family is letting these go to waste!

M&M Rice Krispie Treats Tips and Tricks

Use Unsalted Butter

Listen, I truly love a salt and chocolate moment, but you can definitely take it too far in this Rice Krispie treats recipe. Using salted butter makes these treats overall too salty.

If you want your Rice Krispie Treats a little saltier, it’s best to add some flaky salt on top at the end.

Outside of unsalted butter, here’s what else you’ll need for your M&M Rice Krispie Treats:

rice krispies, m&m's, butter, and marshmallows

Keep It Low and Slow

Once you gather your ingredients, the first step is to melt your marshmallows and butter. Add them to a large pot and set your heat source to low. Stir frequently as the butter and marshmallows start to melt together.

Once your butter and marshmallows are completely melted, you should be left with a sticky paste.

melting marshmallows and butter in a pot

Add Your Rice Krispies to the Pot

Adding your Rice Krispies directly to the pot means less clean-up! Remove the pot from heat, add your Rice Krispies, and use a spatula or wooden spoon to fold the cereal in until it is completely coated.

Green tip: Speaking of cleanup, if you have a dishwasher-use it! Comparing dishwashing to handwashing, using an efficient dishwasher uses 1/6th the amount of water to get your dishes clean!

Act Fast

Once you fold in your Rice Krispies, your mixture will start to harden to form Rice Krispie Treats. The quicker you transfer your mixture out of the pot and into your baking dish, the better!

That means that prepping your baking dish is key. You can opt for a 9″ x 13″ baking dish to get treats that are about 1 inch thick, or you can use a 9″ x 9″ square baking dish for thicker treats like the ones pictured.

Quick Note: Add parchment paper to the bottom to make it easier to lift out of your dish.

Be careful! Your mixture is hot! Use a spatula or wooden spoon to flatten it down into your baking tray.

stirring rice krispies into melting marshmallows

Add Your M&M’s Last

It’s important to not allow the M&M’s to get too hot. The color on the candy coating can easily melt and spread, and the chocolate can melt, too. So, it’s best to add them last.

Add half of your mixture to your baking dish of choice and flatten it down with a spatula or spoon. Then, add roughly half of your M&M’s on top, trying your best to distribute them evenly.

Next, add the remaining Rice Krispie treat mixture, spread it out, and add the rest of the M&M’s to the top. At this point, I like to use a piece of parchment paper to place on top and press the Rice Krispie’s down flat to shape them perfectly.

using your hand and parchment paper to push down rice krispie treats to set

Don’t Cut ‘Em ‘Til They’re Set

Once you’ve transferred your mixture to the baking dish, it will need to set completely. Give it an hour or so before removing it from the dish and cutting it into strips, roughly 2-inches by 2-inches.

To speed up the setting process, you can stick them in the refrigerator. That way, they’ll be set in about 45 minutes.

Should You Have Leftovers

Store your treats at room temperature for up to 3 days or in the refrigerator for a week! Make sure to seal them in an airtight container to avoid staleness.

To freeze, store cut pieces in an airtight freezer-safe bag and thaw before enjoying. They’ll keep in the freezer for up to two months.

stack of colorful rice krispie treats

Why You Should Make These M&M’s Rice Krispie Treats

  • They’re nostalgic! One bite of a Rice Krispie Treat and I feel like a kid again!
  • They’re easy. Just stir, press, and set!
  • They’re fun! The colorful M&M’s add a fun crunch to every bite!

If you’re loving these M&M’s Rice Krispie Treats and want more cereal fun, check out these Peanut Butter Rice Krispie Treats dipped in chocolate and Fruity Pebbles Cookies.

Colorful M&M Rice Krispie Treats

5 from 2 votes
Recipe by Marley Goldin Course: DessertCuisine: American


Prep time


Cooking time


Setting Time


Total time



These M&M Rice Krispie Treats are the most colorful, fun, and sticky-sweet way to treat yourself, without ever turning on the oven!


  • 3 tablespoons unsalted butter

  • 16 ounces marshmallows (regular preferred, but mini works, too!)

  • 6 cups Rice Krispies

  • 1 cup classic M&M’s


  • Line a baking dish with parchment paper. Use a 9″ x 13″ baking dish to get treats that are about 1 inch thick, or you can use a 9″ x 9″ square baking dish for thicker treats like the ones pictured.
  • Add butter and marshmallows to a large pot over low heat, stirring frequently.
  • Remove from heat and fold in Rice Krispies.
  • Working quickly, add half of the Rice Krispies mixture to the lined baking dish and use a spatula or wooden spoon to push it into the bottom of the dish. Sprinkle roughly half of the M&M’s on top, distributing them as evenly as possible.
  • Layer the rest of the Rice Krispies mixture on top, and add the rest of the M&M’s. Use a piece of parchment paper to lay on top and press down on the Rice Krispies and M&M’s to shape your treats.
  • Allow them to set at room temperature for about an hour, or in the refrigerator for 45 minutes before removing from the tray and cutting into 2″ x 2″ squares.

Pro Tips

  • Use unsalted butter to avoid your treats being too salty.

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