Lucky Charm Marshmallow Squares Ingredients: 1 stick salted butter 16 oz. mini marshmallows (1 bag) 12 oz. Lucky Charms cereal Instructions: In a large pan,melt the butter over medium low heat. Add the mini marshmallows and stir constantly. Remove from heat and add the Lucky Charms. Grease a 9x 13 pan with nonstick cooking spray. Spread into the pan. Use your hands to press the marshmallow treats evenly into the pan. Allow them to cool completely. Cut into bars and serve.