Step 1

Line a 9-inch cake pan with non-stick aluminum foil, or with lightly-greased regular foil. Set aside.

Step 2

In a large, greased bowl, place the cereal.

Step 3

In a large, microwave-safe bowl, place the marshmallows and butter. Heat for 1 minute. Stir very well, using the residual heat to fully melt the marshmallows and butter. Stir until very smooth.

Step 4

Pour the marshmallow mixture over the cereal and gently stir to fully combine.

Step 5

Transfer the mixture to the cake pan and press evenly. TIP: Use an 8-inch cake pan to help flatten the treats. Let set for about 2 hours, or 1 hour in the fridge.

Step 6

Prepare royal icing, divide, and tint any preferred colors.

Step 7

Prepare decorating bags with couplers and tips, fill with your icing, and close tightly with rubber bands.

Step 8

Decorate! The icing will fully set overnight.