Melt the marshmallows and butter in a saucepan, stirring constantly over medium heat. Once marshmallows are completely melted, add the green food coloring and stir until evenly colored. Remove from heat.Add Lucky Charms cereal and chocolate chips, stirring constantly to evenly coat with marshmallow mixture. Cover clean hands with butter or cooking spray and shape cereal mix into 4-leaf clover molds. Serve to your lucky guests!