In an 8x8 or 9x9 pan, mix the cereal and chopped chocolate sandwich cookies, mixing until evenly distributed.  This can also be completed in a separate bowl, but I like this method to save on dishes.

On low heat. melt the butter in a medium to large saucepan.  Once melted, add in the marshmallows, stirring constantly with a rubber spatula until the marshmallows are also melted and homogenous. Turn the Note: if adding food coloring, place a few drops in when half of the marshmallows melted.

Turn the stove off and immediately add the cereal and chopped chocolate sandwich cookies to the saucepan. Stir until the cereal is completely covered in the melted marshmallow mixture.

Transfer the cereal and marshmallows back into the pan and let cool on a wire rack.  These will cool very quickly, but I recommend giving them about 30 minutes.

Once cooled, slice to your desired shape and size, serve and enjoy!