Oven: Reheat the leftovers at 350°F until piping hot all the way through (this will take 15-30 minutes, depending on how much of the pie you are reheating). If you're re-heating leftovers, I recommend transferring them to a clean baking dish to avoid food burnt into the dish. Microwave: Make sure you put the pie in a microwave-safe dish. Cover and microwave in 30 second bursts until piping hot all the way through. Check the pie in between (careful, it can get hot!) and stir a little to make the food heat evenly.