Dessert, St. Patricks Day

Lucky Charms Bars – Marshmallow Cereal Treats

Lucky Charms Bars are a fun spin on classic marshmallow crispy treats. The festive marshmallows in each box make for a perfect Spring snack.

If love gooey marshmallow treats, like a classic Rice Krispie treat, you have to try Lucky Charms Bars! They are made exactly like Rice Krispies treats but use Lucky Charms cereals instead. Lucky Charms is a festive cereal, perfect for St Patrick’s Day, because of all the different kinds of marshmallows in the cereal. There are hearts, stars, horseshoes, clovers, pots of gold, and rainbows in every bowl of Lucky Charms. They are a perfectly festive way to dress up a snack bar!

Lucky Charms Bars stacked on a white plate in front of a box of Lucky Charms cereal.

Spring is the perfect time to add a little fun to snack time with magic-themed treats! There is St. Patrick’s Day in March, Find a Rainbow Day in April, and Fairy Day in June. Not to mention birthdays or special occasions. For those days that call for a little extra fun, try Lucky Charms bars!

Serve these festive treats with a Rainbow Fruit Tray for St. Patrick’s Day!

Ingredients for Lucky Charms Bars

  • Lucky Charms Cereal – You can’t make these fun St. Patrick’s Day treats without a box of Lucky Charms
  • Marshmallows – Use larger or mini marshmallows and melt them in a pan with butter to create a gooey marshmallow sauce.
  • Butter – A few teaspoons of melted butter deepens the flavor of these treats and helps bind the cereal mixture together.
Ingredients for Lucky Charms Bars on a marble surface including Lucky Charms cereal, small marshmallows, and butter.

How to Make Lucky Charms Bars

These fun Lucky Charms treats only require 3 simple ingredients. They are an easy treat to make, but are the perfect way to celebrate St. Patrick’s Day!

Step One – In a large saucepan, melt 2 tablespoons of butter on medium-low heat. Add the marshmallows to the melted butter and stir. Regularly stir the mixture until the marshmallows are completely melted. You can also melt butter and marshmallows in the microwave. Place the ingredients in a large bowl and microwave in 45-second increments. Be sure to stir the gooey marshmallows each time you remove the bowl from the microwave. Repeat this until the marshmallows are melted.

Step Two – Next, add the colorful Lucky Charms cereal to the melted marshmallow mixture. Stir this until all of the cereal is coated in melted marshmallows.

Step Three – Lightly spray a 9 x 13-inch pan with non-stick spray. I like to use coconut oil, but whatever you prefer is fine. Then, cut two pieces of parchment paper into 10 x 13-inch strips. Lay one piece of parchment paper inside the baking dish horizontally. Then lay the other vertically. The parchment paper should form a cross shape and cover all four sides of the baking pan.

Step Four – Pour the warm marshmallow and cereal mixture into the lined baking pan. Then use a flat rubber spatula to press the cereal bars mixture into an even layer along the bottom of the pan.

Lucky Charms Bars in a 9x13 glass baking pan lined with parchment paper.

Step Five – Sprinkle the top of the Lucky Charm treats with more cereal, extra marshmallows, and rainbow sprinkles. 

Step Six – Let the gooey Lucky Charms Treats cool for at least an hour before cutting them into squares and serving.

A Tip for Cutting Marshmallow Treats

Here’s a tip for cutting any treats made with melted marshmallows! Heat a mug of water in the microwave for 1-2 minutes. Then, dip a butter knife into the hot water. Wipe any excess water from the knife. Use the heated knife to cut through the treats. The heat slightly melts the marshmallows again. This makes them more pliable and easier to cut without sticking.

Three Lucky Charms Bars stacked on top of each other.

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How to Store Leftover Lucky Charms Bars

Keep leftover homemade Lucky Charms Treats in an airtight container at room temperature.

Are Lucky Charms Treats Gluten-Free?

They can be! Lucky Charms cereal is naturally gluten-free. Check their website for more details. And there are gluten-free marshmallows as well. For example, Good&Gather marshmallows at Target are gluten-free.

Can I Make These Treats in the Microwave

Yes! Melt the butter and marshmallows in a large microwave-safe bowl in 45-second increments. Stir each time you check the mixture. Once the marshmallows are completely melted, stir in the cereal. You can reheat the mixture for 15 seconds if it starts to firm while you’re still stirring.

These Lucky Charms Marshmallow Treats are the perfect fun dessert for a St. Patrick’s Day celebration! They are delicious for kids and adults. If you love traditional Rice Krispie treats, then you will love these festive treats!4

More Fun and Festive Treats to Try

Three Lucky Charms Bars stacked on top of each other.

Lucky Charms Bars

Lucky Charms bars are a fun spin on the classic marshmallow treat. The fun colors and shapes make them the perfect festive snack.
Cook Time 10 minutes
Resting Time 2 hours
Total Time 2 hours 10 minutes
Course Snack
Cuisine Baked Goods
Servings 12 bars


  • 1 large microwave-safe bowl
  • 1 9×13 baking pan
  • 1 silicone spatula


  • 10 oz small marshmallows
  • 2 tbsp salted butter
  • 10 oz Lucky Charms cereal


  • Melt 10 oz of small marshmallows and 2 tablespoons of salted butter in a large microwave-safe bowl in 45-second increments.
  • Stir the mixture every 45 seconds until completely melted.
  • Stir in 10 oz of Lucky Charms cereal.
  • Mix until all of the cereal is thoroughly coated in melted marshmallows.
  • Pour the mixture into a 9×13 baking pan lined with parchment paper.
  • Press the mixture into the pan using a silicone spatula.
  • Add extra cereal or rainbow sprinkles on top.
  • Allow treats to cool for at least 2 hours.
  • Cut into squares using a butter knife.
Keyword cereal bars, lucky charms bars, marshmallow treats


  1. Neely Moldovan

    Oh these sound so fun! I bet my son would LOVE THEM!

  2. I love the rainbow fruit stick! I have a party coming up this weekend and I just might bring these! Thanks for the idea.

  3. This post simultaneously makes me SO HAPPY and makes me want to cry haha. Lucky Charms has been my favorite cereal for my entire life – but I’m allergic to oats and can no longer eat them, which is super sad. I’ve found a few alternatives (like the Frosted Flakes Lucky Charms with corn flakes and mallows instead of oat puffs) but they probably wouldn’t make the best bars haha. I might just buy a bag of the marshmallows at some point and add them to the other cereals I can have haha!

  4. Wow, these look so yummy! Definitely will have to be something I make with my nephews!

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