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Lucky Charms Marshmallow Treats

If you're a fan of Lucky Charms cereal, you're going to love these Lucky Charms Marshmallow Treats! They're just like classic rice Krispies treat, but made with the iconic magically delicious cereal instead. 

These chewy, gooey marshmallow bars are packed full of crunchy Lucky Charms pieces. They're a whimsical, nostalgic treat perfect for kids and kids-at-heart.

Lucky Charms Marshmallow Treats stacked on the counter.

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These colorful marshmallow cereal bars make a fun dessert for birthday parties, bake sales, or just a sweet snack. They're super easy to whip up with just a few simple ingredients. The hardest part is not eating all the Lucky Charms straight from the box!

Of course, these Lucky Charms Marshmallow Bars are perfect for a St. Patrick’s Day party, but they’re also perfect for any other time you want a clorful and fun treat!

No matter when I make a batch of these Lucky Charms treats, they disappear quickly. The bright colors and fun cereal shapes make them so hard to resist. Who can say no to a dessert made with their favorite sugary breakfast cereal?

Ingredient Notes

See the printable recipe card below for all ingredients, specific measurements, and complete instructions.

Ingredients to make Lucky Charms Marshmallow Treats set out on the counter.
  • Unsalted Butter: Using unsalted butter allows you to control the amount of salt. The butter gets melted to create a smooth, luscious base for the marshmallow treats.
  • Vanilla Extract: A little vanilla enhances the overall flavor. For the best taste, use real vanilla extract, not artificial.
  • Mini Marshmallows: You'll need an entire 10 oz bag of these to achieve the perfect chewy, gooey texture in every bite. 
  • Lucky Charms Cereal: 6 cups of the crunchy oat pieces and marshmallow shapes will provide contrast to the soft marshmallow base.

How To Make Lucky Charms Marshmallow Treats

Start by preparing your baking pan. Line a 9x13-inch pan with parchment paper, making sure it overhangs the sides to use as a sling later. Coat the parchment with non-stick cooking spray to ensure easy removal of the set treats.

Mini marshmallows and butter in a sauce pan.
Melted butter and mini marshmallows in a sauce pan.

Next, melt the butter in a large pot over medium heat. You want the pot large enough to easily mix in the cereal later. Once the butter is melted, add in all of the mini marshmallows. Reduce the heat to low and stir constantly until the marshmallows have completely melted into a smooth, lump-free mixture. This low gentle heat prevents burning. Mix in the vanilla.

Remove the pot from the heat. Working quickly before it starts to set, pour in the Lucky Charms cereal and fold it in until every piece is coated in the melted marshmallow. The heat from the melted marshmallow will make the cereal pieces slightly soft, giving a wonderful texture contrast to the Lucky Charms marshmallow treats.

Lucky Charms Marshmallow Treats in baking dish lined with parchment paper.

Transfer the mixture to your prepared baking dish. Use a greased rubber spatula or your hands (also lightly greased) to evenly press it into the pan, smoothing the top. 

Now comes the hardest part - letting it set! Place the pan in the refrigerator for about 15 minutes. This will allow the marshmallow to cool and firm back up into gooey yet slice-able treats.

Once set, simply lift the slab out using the parchment overhangs. Peel off the paper and cut into squares using a large knife or bench scraper. The treats are ready to enjoy immediately!

Lucky Charms Treats on a wooden serving board.

Recipe Variations

  • Add an extra pop of color. Use green, yellow, or blue gel food coloring to tint the melted marshmallows.
  • Add more marshmallows. Sprinkle some extra Lucky Charms marshmallow pieces on top of the pan before chilling.
  • Make it chocolatey. Drizzle with melted white chocolate or add chocolate chips to the melted marshmallow.
  • Use other cereals. Trix, Froot Loops, and Fruity Pebbles would all make delicious treats using this same method. 

Recipe Tips

  • Use fresh, soft mini marshmallows for best results. Stale marshmallows can make the treats dry and crumbly.
  • Be gentle when folding in the cereal so you don't crush all the pieces. You want plenty of crunchy texture contrast.
  • For extra colorful treats, use a few drops of food coloring in the melted marshmallow.
  • Grease your hands, spatula, and knife well to prevent sticking when pressing and cutting the treats.
  • These Lucky Charms treats can be stored in an airtight container at room temperature for 3 days. For longer storage, you can also store them in the refrigerator for up to 5 days. 
Lucky Charms Marshmallow Treats  stacked on the counter.

Need more dessert ideas for St. Patrick's Day? Try these Mint M&M Brownie Cookies or this Jello Lime Pie.

Whether you make them for St. Patty’s Day or just to jazz up a normal day, these Lucky Charms Marshmallow Treats are sure to put a smile on your face. They're gooey, crunchy, sweet and so much fun to make!

Three Lucky Charms Marshmallow Treats stacked on counter.

Lucky Charms Marshmallow Treats Recipe

Author: Judy Wilson
These Lucky Charms marshmallow treats are chewy, gooey marshmallow bars packed full of crunchy Lucky Charms pieces. They are super easy to whip up with just a few simple ingredients. 
Prep Time 15 minutes
Cook Time 0 minutes
Set Time 15 minutes
Total Time 30 minutes
Course Dessert
Cuisine American
Servings 15
Calories 142 kcal


  • 4 Tablespoons unsalted butter
  • 1 teaspoon vanilla extract
  • 10 ounce package mini marshmallows
  • 6 cups Lucky Charms mini cereal


  • Line a 9x13 baking pan with parchment paper and spray with non-stick cooking spray. Set aside.
  • Melt butter in a large pot over medium heat.
  • Add the mini marshmallows and reduce the heat to low. Stir constantly until all the marshmallows are fully melted. Add the vanilla extract and mix well.
  • Remove the pot from the heat and pour in the cereal. Mix well until all the cereal is fully coated in marshmallows.
  • Dump the mixture into the prepared baking pan and press down evenly with a rubber spatula or your hands. Add a little non-stick cooking spray to your hands/rubber spatula to prevent sticking.
  • Place the baking pan in the refrigerator for approximately 15 minutes, or until the mixture is cool.
  • Remove from the refrigerator and lift the marshmallow treats out of the pan using the parchment paper. Cut into squares and serve.


These Lucky Charms treats can be stored in an airtight container at room temperature for 3 days. For longer storage, you can also store them in the refrigerator for up to 5 days. 


Calories: 142kcalCarbohydrates: 27gProtein: 1gFat: 4gSaturated Fat: 2gPolyunsaturated Fat: 0.3gMonounsaturated Fat: 1gTrans Fat: 0.1gCholesterol: 8mgSodium: 109mgPotassium: 34mgFiber: 1gSugar: 16gVitamin A: 500IUVitamin C: 4mgCalcium: 64mgIron: 3mg
The nutritional information provided is approximate and should only be used as a general guideline. It is an estimate that will vary based on cooking methods and brands of ingredients used.
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