Lego Rice Krispie Treats

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LEGO Rice Krispies are easy to make for your LEGO lovers. Perfect for a LEGO birthday party, LEGO-themed hypoallergenic treats for schools, or just fun for LEGO lovers!

This fun recipe came about because my son wanted to have a LEGO themed birthday party. I’m not the most crafty person. In fact, I often call myself an anti-craft. I just have no patience! I knew I needed something super easy and it couldn’t be easier to make Rice Krispies!

These easy-to-make LEGO Hearts treats are just traditional rice cracker treats cut into rectangles, sprinkled with icing sugar and topped with M&Ms. It’s pretty simple, but you might need a few tricks to help you do it. Obviously I’m not the craftiest person, so I always need some tricks to make things cute!

LEGO Rice Krispies in the shape of toy LEGO bricks filled with red, blue and green icing and topped with matching colorful M&Ms

The key to making this recipe work is using icing sugar. Icing is not frosting! It starts out as a viscous liquid that hardens when exposed to air. This works really well for this particular application, as the icing melts into the rough surface of the popcorn candies, creating a smooth and shiny surface, just like real LEGO bricks. A bonus is that since the frosting hardens, they can be easily packed without mess!

You should be able to find cookie icing all made and dyed in the baking section of your supermarket.If you’d like to make your own frosting, here’s the recipe here, but it does complicate things, so if you’re shooting a simple food craft, stick to store-bought. You can use any color you like, just make sure you have M&M’s coordinating colors.


  • Cool your rice crackers completely before cutting.
  • Make sure the top of your rice cracker is as flat as possible
  • Use one color of icing at a time as the icing hardens quickly.
  • Use a knife to spread the icing lightly, but don’t add too much icing as it may run over the edges.
  • Turn the M&Ms “m” side down so the “m” doesn’t appear

Lego Rice Krispie Treats icing comes in assorted colors and has M&Ms on top to look like toy LEGO bricks

LEGO Rice Krispies are easy to make for your LEGO lovers. Perfect for a LEGO birthday party, LEGO-themed hypoallergenic treats for schools, or just fun for LEGO lovers!

Preparation time 30 minute

total time 30 minute

raw material

  • 5 cup Rice Krispies
  • 1/4 cup butter
  • 4 cup Mini Marshmallows
  • 1 Big Bag of M&Ms
  • multiple colour Red, blue, green, yellow cookie decoration icing


  • Pour the Rice Krispie into a large mixing bowl. on hold.

  • Melt butter in a saucepan over low heat. Once the butter has melted, pour in the mini marshmallows and stir constantly until the marshmallows are completely melted and smooth.

  • Pour the marshmallows over the rice crackers and toss together until just combined.

  • Spoon rice crispies into a lightly greased 9×13 pan. Press down with a sheet of wax paper or parchment until flat. Let cool completely before proceeding. You can put them in the freezer for 5 minutes to speed up the cooling.

  • While the rice crackers are cooling, divide the M&Ms into colors that match the icing you’re using. Each Lego Krispie requires 6 bricks of the same color.

  • Cut the rice crackers into 18 rectangles. Squeeze some icing into a bowl. Dip the tops of the rice crackers in the icing and smooth them out with a butter knife. While the icing is still wet, arrange the M&Ms in parallel rows of 3. Repeat for remaining rice crackers with a different colored icing.

Calories: 256kcal | carbohydrate: 39G | protein: 2G | fat: 10G | Saturated fat: 6G | cholesterol: 12mg | sodium: 107mg | Potassium: 11mg | sugar: 27G | Vitamin A: 785unit | Vitamin C: 6.1mg | calcium: 36mg | iron: 3.2mg