Once the balls have finished chilling, I like to place a toothpick into each ball and use it to dip the peanut butter balls into the chocolate. Because everything is chilled, the balls hold together enough to give you a good coating. You can also pour the chocolate directly onto the peanut butter balls. This is best done if you have a metal rack with a sheet pan under it to catch the chocolate. Set all the balls on the rack, then slowly pour the chocolate over the balls, rotating them with a toothpick to get chocolate on all sides.