Dip half of each bar into the chocolate and return to the baking sheet. Dip the other half of each bar in the chocolate. Reheat the chocolate in a double boiler or microwave oven as needed. Using the side of a butter knife, create three waves in the chocolate over the surface of the bars, if desired. Refrigerate until the chocolate has set, about 30 minutes. Transfer to an airtight container. Let sit out at room temperature for 5 minutes before serving. The bars will keep for 2 weeks in the refrigerator.