Get ready to make snack time extra fun with these colorful Lego Rice Krispie Treats! Perfect for kids’ parties, playdates, or just a creative kitchen activity, these no-bake treats are super easy to make. With vibrant frosting, M&M “studs,” and endless ways to customize, they’re a hit with kids and adults alike.
Whether you're celebrating a Lego-themed birthday or just want a playful snack, these treats stack up beautifully. Let’s turn Rice Krispies into edible building blocks everyone will love!

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Why This Recipe Works
- Fun for Kids: Lego Rice Krispie Treats are colorful, playful, and perfect for little Lego lovers to enjoy and help make!
- Easy to Customize: You can get creative with colors, sizes, and decorations to match any party theme or mood.
- No-Bake Magic: They’re quick, simple, and don’t require an oven—perfect for busy moms!
🥘 Ingredients
- Rice Krispie Treat Bars: Offer a delightful crispy texture, serving as the sturdy base for these playful treats.
- Vanilla Frosting: Provides sweetness and acts as an adhesive, perfect for holding decorative elements in place.
- M&M’s: Add colorful crunch, enhancing both the visual appeal and texture of each treat.
- Food Coloring: Allows for vibrant customization, transforming the treats into eye-catching creations inspired by Lego bricks.
For the complete list of ingredients with measurements and instructions, please see the recipe card at the bottom of the post.
📖 Substitutions & Variations
- Rainbow Sprinkle Lego Treats: Add a sprinkle explosion by coating the frosted bars with matching-colored sprinkles for extra pizzazz!
- Chocolate Lovers’ Lego Treats: Swap the frosting for melted chocolate and use chocolate-coated candies as the Lego studs.
- Fruity Fun Lego Treats: Use flavored frosting like strawberry or lemon and decorate with colorful gummy candies instead of M&Ms.
🔪 How To Make Rice Krispie Lego Treats
- Step 1: Start by preparing your frosting. Divide it into 5 bowls, and add 4-5 drops of food coloring to each bowl. Mix well until you have vibrant, Lego-inspired colors!
- Step 2: Unwrap your Rice Krispies treats. Leave some whole, and cut others into smaller square or rectangular pieces to create a variety of Lego block sizes. Once ready, frost each piece with a different color of the frosting you prepared.
- Step 3: Now it’s time to add the details! Place matching M&M's on the top or side edges of each frosted bar to mimic the studs on a Lego block. Press gently so they stick well.
- Step 4: Your Lego Krispie Treats are ready! Arrange them on a serving tray and watch your creations stack up like real Lego blocks. Serve and enjoy the fun, colorful treats!
👩🍳 Expert Tips
- Chill Before Cutting: Pop the Rice Krispies in the fridge for 10-15 minutes before cutting to get clean, sharp edges.
- Smooth Frosting Hack: Use an offset spatula or the back of a butter knife dipped in warm water to get a super smooth frosting finish.
- Stick with Precision: Dab a tiny bit of frosting on the back of each M&M to help it stick perfectly in place.
- Add Fun Details: Use edible markers to draw tiny Lego logos or designs on the frosting for an extra wow factor!
💭 FAQs
Yes, you can absolutely use candy coating instead of frosting! Melt colorful candy melts, dip the Rice Krispies in them, and let them set for a smooth, shiny finish that holds the M&Ms perfectly.
Of course! Skittles, gummy candies, or even small marshmallows can work as fun alternatives.
Yes! You can make them a day in advance and store them in an airtight container to keep them fresh.
Absolutely! Homemade Rice Krispies work just as well and give you more control over the flavor and texture.
Spread the frosting with a flat spatula or butter knife, and work in thin, even layers for a smoother look.
🧂Serving Suggestions
These fun lego themed treats are great for a part, for a lego activity day or as a fun idea for the classroom! Enjoy!
🍽 Related Recipes
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Lego Rice Krispie Treats
Ingredients
- 8 Bars Rice Krispy Treat
- 1 Can Vanilla Frosting
- Large Bag of M&M’s
- Food Coloring Red, Orange, Yellow, Green, Blue
Instructions
- Start by preparing your frosting. Divide it into 5 bowls, and add 4-5 drops of food coloring to each bowl. Mix well until you have vibrant, Lego-inspired colors!
- Unwrap your Rice Krispies treats. Leave some whole, and cut others into smaller square or rectangular pieces to create a variety of Lego block sizes. Once ready, frost each piece with a different color of the frosting you prepared.
- Now it’s time to add the details! Place matching M&M's on the top or side edges of each frosted bar to mimic the studs on a Lego block. Press gently so they stick well.
- Your Lego Krispy Treats are ready! Arrange them on a serving tray and watch your creations stack up like real Lego blocks. Serve and enjoy the fun, colorful treats!
These treats are my go-to for building fun in the kitchen—colorful, no-bake, and a hit with kids and adults alike. It's playtime and snack time rolled into one!