In a large pan melt butter using medium heat.

Add marshmallows and stir until melted.

Pour in the cereal and mix to incorporate.

Spray plastic eggs with cooking spray. I found it was easiest to use eggs that split vertically. You could just use 1 or 2 eggs for this process as the cereal does not take long to take the shape of the egg.

Spoon the cereal mixture into each half of the egg then close egg to form shape. Pop cereal out after about 10 seconds.