Grease a 8 x 8" clear baking pan with a nonstick cooking spray.
In a large mixing bowl, heat your marshmallows and butter in the microwave for 2 minutes or until the marshmallows get puffy.
Stir your marshmallow mixture well and mix in 6 cups of your lucky charms cereal.
Scoop your Lucky Charms mixture into your greased baking dish and press your cereal mixture into your pan evenly (I like to spray a non stick cooking spray on a plastic zip lock bag and press with that)
Press more marshmallows onto the top of your bars while the mixture is still sticky.
Refrigerate for 15 minutes and slice into squares.
ENJOY!