3-Ingredient Lucky Charms Rice Krispie Treats
These 3-ingredient Lucky Charms Rice Krispie Treats swap classic cereal for the marshmallow-studded stuff you ate as a kid. They set up fast with zero baking, so they are perfect for an after-school snack or a last-minute party dessert.
The bars stay soft and chewy for days, with pockets of colorful marshmallow bits in every bite. No candy thermometer, no guesswork, just one pot and a few minutes of stirring.
Why These Treats Work
The marshmallow-to-cereal ratio is higher than most, so every bar stays soft instead of turning crunchy the next day. A little extra vanilla and a pinch of salt keep the sweetness balanced.
I test batches with different cereals, and Lucky Charms is the one my kids beg for. The oat-based pieces have a toasty flavor plain crisp rice does not, and the tiny dehydrated marshmallows stay chewy even after melting.
Ingredients
- 4 tbsp unsalted butter: plus a little extra for greasing the pan
- 10 oz mini marshmallows: fresh bag for the smoothest melt
- 6 cups Lucky Charms cereal: no need to pick out the marshmallow bits
- 1 tsp vanilla extract: rounds out the sweetness
- Pinch of salt: a small pinch, fine sea salt works best
Variations / Substitutions
- Cereal swap: try the same method with any sweetened cereal, like Froot Loops or Cap’n Crunch; the texture will differ slightly but the bars will hold up.
- Add white chocolate chips: fold in a handful with the cereal for a creamier bite and extra sweetness.
- Dairy-free: use vegan butter sticks and a bag of vegan mini marshmallows, like Dandies; the bars set just as well.
- For a classic version without the rainbow marshmallows, try our regular Rice Krispie Treats.
How to Make 3-Ingredient Lucky Charms Rice Krispie Treats
Step 1: Melt the Marshmallows
Grease an 8×8 inch pan with a little butter and line it with parchment paper, leaving overhang on two sides. In a large pot over low heat, melt the 4 tbsp unsalted butter. Add the 10 oz mini marshmallows and stir constantly until they are almost completely melted, about 3 minutes. Remove the pot from the heat and stir in the 1 tsp vanilla extract and a pinch of salt.
The marshmallows will turn into a glossy, stretchy puddle. If the mixture looks dull or stiff, the heat was too high and the marshmallows seized; start over with fresh marshmallows and low heat.
Step 2: Fold in the Cereal
Immediately dump in the 6 cups Lucky Charms cereal and fold quickly with a silicone spatula until every piece is coated. Work fast, within about 30 seconds, because the marshmallow mixture begins to set as it cools.
The cereal should be evenly coated, with some of the tiny marshmallows still distinct. Stirring too long can dissolve them into a pinkish swirl instead of leaving little chewy pockets.
Step 3: Press and Slice the Bars
Scrape the mixture into the prepared pan and press it into an even layer with the back of a buttered spatula or damp hands. Let it cool at room temperature for 20 minutes, then lift the slab out using the parchment and slice it into 16 squares.
The bars will be soft and slightly gooey right after slicing. For cleaner edges, chill the pan for 10 minutes before lifting, but they taste great either way.
A Few Tips for Better Treats
- Use fresh marshmallows. A stale bag will not melt smoothly and can leave lumps in the bars.
- Press the mixture gently into the pan. Packing it down hard makes dense, tough bars instead of soft ones.
- For extra color, scatter a few Lucky Charms marshmallow bits on top before pressing. They stick to the warm marshmallow and add a fun pop on the surface.
- Line the pan with parchment and butter it lightly so nothing sticks. Getting the slab out clean makes slicing a breeze.
If you want a different batch size, here is how to adjust for common pans:
| Pan Size | Cereal | Marshmallows | Butter | Yield |
|---|---|---|---|---|
| 8×8 inch | 6 cups | 10 oz | 4 tbsp | 16 squares |
| 9×13 inch | 9 cups | 16 oz | 6 tbsp | 24 squares |
Keeping Them Fresh
Store the bars in an airtight container at room temperature for up to 3 days, or in the fridge for up to a week. If they firm up after a few days, a 10-second zap in the microwave brings back their chewy texture.
Frequently Asked Questions
Can I use stale Lucky Charms?
Stale cereal will still work, but the bars will be less crisp. Use a fresh box for the classic crunch and the brightest marshmallow bits.
Can I double the recipe?
Yes, double all ingredients and use a large pot and a 9×13 inch pan. The melting time will be a little longer, about 5 minutes, since there is more marshmallow volume.
Can I add food coloring?
A few drops of gel food coloring stirred into the melted marshmallow mixture work fine. Liquid food coloring can thin the mixture slightly, so gel is a safer pick.
My bars are too sticky to slice cleanly. Help!
Chill the pan for 10 to 15 minutes before lifting the slab, then wipe your knife with butter between cuts. A sharp, greased blade slips through the gooey layer easily.
3-Ingredient Lucky Charms Rice Krispie Treats Recipe
Ingredients
Method
- Grease an 8×8 inch pan and line it with parchment. In a large pot over low heat, melt the butter. Add the marshmallows and stir constantly until almost melted, about 3 minutes. Remove from heat, then stir in the vanilla and salt.
- Immediately fold in the Lucky Charms cereal with a silicone spatula until evenly coated.
- Press the mixture into the prepared pan in an even layer. Cool at room temperature for 20 minutes, then lift out and slice into 16 squares.
