For the best flavor, use a high-quality semi-sweet chocolate. Milk chocolate can be substituted, but the bars will be much sweeter. If you don't have cherry baking chips, you can use chopped maraschino cherries (well-drained and patted dry) or dried cranberries for a slightly different flavor profile. Store the Bing Bars in a cool, dry place in an airtight container. Separate the layers with waxed paper to prevent sticking. These bars are best enjoyed within 3-4 days.