If you have any leftover turkey shepherd's pie, you can store it in the refrigerator, tightly covered in plastic wrap or aluminum foil, for 3-4 days. If you only have a portion or two remaining, transfer it from the baking dish to an airtight container before storing. Some may argue that shepherd's pie tastes even better the next day, when the flavors have had time to blend. To reheat, place a serving in a microwave-safe container and reheat at 45 second intervals until warmed through. Or, rewarm the serving on a small baking dish in a preheated 350F oven for 10-15 minutes.