Melt two 3.5-oz. bars of semisweet, bittersweet, milk or white chocolate (for a smooth, glossy finish, temper your chocolate). Now you're ready to dip and decorate. Dunk the cookies in the chocolate and then in chopped nuts, poppy seeds, dragees, crushed peppermints, coconut flakes, sanding sugar or whatever you dream up! Place on a parchment-lined baking sheet and chill until set.