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If you are looking for a dessert that is as whimsical as it is delicious, this Lucky Charms Fudge is a total showstopper. This recipe takes the classic, creamy texture of white chocolate fudge and packs it with the iconic, colorful marshmallows from your favorite childhood cereal. It is a no-bake lucky charms dessert that requires only three simple ingredients and about five minutes of active prep time.

The beauty of this st patricks day fudge lies in its vibrant “rainbow” aesthetic. It’s the perfect treat for school parties, office potlucks, or leaving out for the leprechauns. Because it’s so easy to make, it’s also a fantastic kitchen project for kids who love to help sort the “charms” and decorate the top with sprinkles.
Table of Contents
Why You’ll Love This Fudge
- Only 3 Ingredients: White chocolate, frosting, and cereal marshmallows—that’s it!
- No-Bake Miracle: No candy thermometers or stovetop boiling required.
- Perfectly Creamy: Using vanilla frosting as a base creates a fudge that is soft, smooth, and never crumbly.
- Visually Stunning: The bright pops of color from the marshmallows make this a standout on any dessert tray.
Ingredients
- 2 bags (11-12 oz each) White Chocolate Chips
- 1 container (16 oz) Vanilla Frosting
- 2 cups Lucky Charms Marshmallows (you can buy “marshmallow only” bags or pick them from the cereal)
- Optional: Festive St. Patrick’s Day sprinkles

Instructions
1. Prep the Pan
Line an 8×8 or 9×9-inch square baking dish with parchment paper or aluminum foil, leaving an overhang on the sides. Lightly spray with non-stick cooking spray to ensure easy removal.
2. Melt the Chocolate
Place the white chocolate chips in a large microwave-safe bowl. Microwave in 30-second increments, stirring well between each, until the chocolate is completely melted and smooth.
3. Combine with Frosting
Remove the lid and foil seal from the vanilla frosting. Microwave the frosting for about 30 seconds until it is slightly pourable. Pour the frosting into the melted white chocolate and stir until completely combined and smooth.
4. Fold in the “Luck”
Gently fold in about 1 ½ cups of the Lucky Charms marshmallows. Work quickly, as the fudge will start to set as it cools.
5. Spread and Decorate
Pour the mixture into the prepared pan and spread it into an even layer using an offset spatula. Immediately press the remaining ½ cup of marshmallows and the optional sprinkles into the top of the fudge.
6. Chill and Slice
Refrigerate for at least 2 hours (or overnight) until the fudge is firm. Use the parchment paper overhang to lift the fudge out of the pan. Slice into small squares and serve.
Expert Tips for Success
- Don’t Overheat: White chocolate is delicate. Always use short bursts in the microwave to prevent it from “seizing” (getting clumpy and dry).
- Frosting Hack: Using store-bought frosting is the “secret” to the perfect fudge texture. It provides the necessary fats and sugars to keep the fudge soft and sliceable.
- Marshmallow Sorting: If you are picking marshmallows from a box of cereal, try to keep them as dry as possible. Any excess “cereal dust” can make the fudge look grainy.
- Clean Cuts: For the most professional-looking squares, use a large sharp knife and wipe it clean with a warm, damp cloth between every single cut.

Variations
- Rainbow Fudge: Tint the white chocolate mixture with a drop of green gel food coloring before adding the marshmallows for an even more festive look.
- Lucky Charms Bark: Spread the mixture extra thin on a large cookie sheet instead of a square pan to create a “shatter-style” fudge bark.
- Peanut Butter Twist: Use peanut butter chips instead of white chocolate for a “Lucky Peanut” flavor profile.
- Golden Pot O’ Gold: Use yellow candy melts and top with gold star sprinkles and Lucky Charms for a treasure-themed treat.
For the ultimate collection of festive, top-rated holiday bakes, don’t miss our master guide to THE BEST 20 ST PATRICK’S DAY DESSERTS & TREATS IDEAS!
FAQ: Lucky Charms Fudge
Q: How do I store Lucky Charms fudge? A: Store in an airtight container in the refrigerator for up to 2 weeks. It is best served chilled, as it can soften if left at room temperature for too long.
Q: Can I freeze this fudge? A: Yes. Wrap the fudge tightly in plastic wrap and store in a freezer bag for up to 3 months. Thaw in the fridge before serving.
Q: Can I use different frosting? A: Yes. Cream cheese frosting or marshmallow-flavored frosting also work beautifully with this recipe.
Q: Why did my fudge turn out oily? A: This usually happens if the white chocolate was overheated. To fix this, you can try stirring in a tablespoon of room-temperature milk, but it’s best to avoid overheating from the start.

Lucky Charms Fudge
Equipment
- Microwave-safe bowl
- Spatula
- 8×8 or 9×9 Baking Dish
Ingredients
- 2 bags white chocolate chips (11–12 oz each)
- 1 container vanilla frosting (16 oz)
- 2 cups Lucky Charms marshmallows
- St. Patrick’s Day sprinkles (optional)
Instructions
- Line an 8×8 or 9×9-inch baking dish with parchment paper or foil, leaving an overhang. Lightly spray with non-stick spray.
- Place white chocolate chips in a microwave-safe bowl. Microwave in 30-second intervals, stirring between each, until smooth.
- Microwave the vanilla frosting for about 30 seconds until slightly softened and pourable.
- Stir the warm frosting into the melted white chocolate until fully combined and smooth.
- Gently fold in 1½ cups of Lucky Charms marshmallows, working quickly before the mixture sets.
- Spread mixture evenly into prepared pan. Press remaining marshmallows and optional sprinkles into the top.
- Refrigerate for at least 2 hours or until firm. Lift out using parchment overhang and slice into squares.