Makes 9-12 bars depending on how you cut them. For the cleanest slices, run your knife under warm water and wipe it dry between cuts. Store leftovers in an airtight container in the refrigerator for up to 7 days. You can freeze the bars for up to 2 months, wrapped and stored tightly in a plastic bag or container. Thaw in the fridge overnight or on the countertop for 30-60 minutes. A shiny metal pan takes the full 35 minutes; a dark metal pan will probably be done in 30.