Aunt Joyce's Lucky Charm Micro Snacks

4 tablespoons butter or margarine

4 cups marshmallows

6 cups Lucky Charms cereal

Grease a 9 X 13 inch pan. Place margarine and marshmallows in microwavable bowl. Microwave uncovered 1 1/2 to 3 minutes, stirring after each minute until mixture is melted and smooth. Stir in cereal until well coated. Press mixture in pan. Cool.