Lucky Charm Rice Krispie Treats are a delightful, whimsical dessert that combines the classic chewy sweetness of marshmallow Rice Krispie treats with the colorful magic of Lucky Charms cereal.
They’re festive, fun, and perfect for St. Patrick’s Day or any time you need a quick and playful snack!
With their gooey marshmallow texture and vibrant cereal mix, these treats are both easy to make and impossible to resist. Whether you’re crafting them for a party or a family treat, they’ll bring a bit of rainbow-filled joy to everyone’s day.
Contents
What You’ll Need for This Saint Patrick’s Day Rice Krispies

Ingredients
- 4 cups Rice Krispies cereal
- 2 cups Lucky Charms cereal
- 1/4 cup unsalted butter
- 1 package (10 oz) mini marshmallows
- 1/2 teaspoon vanilla extract
- Cooking spray or butter (for greasing the pan)
Tools You’ll Need
- Large saucepan
- Mixing spoon or spatula
- 9×13-inch baking dish
- Measuring cups
- Wax paper or parchment paper
Pro Tips for Perfect Lucky Charm Rice Krispie Treats
- Low Heat is Key: Melt the butter and marshmallows over low heat to prevent scorching and ensure a smooth, gooey mixture.
- Grease Everything: Lightly grease your spatula and hands to make pressing the mixture into the pan easier and less sticky.
- Mix Gently: Stir the cereals gently into the marshmallow mixture to avoid crushing the Lucky Charms marshmallows.
- Work Quickly: The marshmallow mixture sets fast, so transfer it to the pan and press it down as soon as it’s combined.
- Make it Extra Festive: Reserve a handful of Lucky Charms marshmallows to sprinkle on top for added color and fun.
Substitutions and Variations
- Gluten-Free: Use gluten-free Rice Krispies cereal and verify that the Lucky Charms cereal is gluten-free.
- Add Sprinkles: Mix in some rainbow sprinkles for extra cheer.
- Dairy-Free: Substitute the butter with a plant-based alternative.
- Peanut Butter Twist: Add 1/4 cup of peanut butter to the melted marshmallow mixture for a nutty flavor.
- Shape Them: Use cookie cutters to make festive shapes like clovers or hearts.
Make Ahead Tips
- These treats can be made up to two days in advance. Store them in an airtight container at room temperature for optimal freshness.
Step-by-Step Instructions
Yield: 16 squares
Prep Time: 10 minutes
Cool Time: 30 minutes
Total Time: 40 minutes
Cuisine: Dessert
Full Ingredient List
- 4 cups Rice Krispies cereal
- 2 cups Lucky Charms cereal
- 1/4 cup unsalted butter
- 1 package (10 oz) mini marshmallows
- 1/2 teaspoon vanilla extract
- Cooking spray or butter (for greasing the pan)
- Prepare the Pan:
Grease a 9×13-inch baking dish with cooking spray or butter to prevent sticking. - Melt Butter and Marshmallows:
In a large saucepan over low heat, melt the butter. Once melted, add the mini marshmallows and stir continuously until fully melted and smooth. Remove from heat and stir in the vanilla extract. - Add the Cereals:
Stir the Rice Krispies and Lucky Charms cereals into the melted marshmallow mixture until evenly coated. - Press into the Pan:
Quickly pour the cereal mixture into the prepared baking dish. Use a spatula or a piece of wax paper to press it down firmly and evenly. - Cool and Cut:
Allow the treats to cool at room temperature for about 30 minutes. Once set, cut them into squares or fun shapes using a knife or cookie cutters.
Pin for later:
