You can freeze the cooled leftovers in an airtight container. Or you can freeze it to bake at a later date. To freeze for later, allow the filling to cool before adding the pie crust. Then, wrap the pan (use a metal pan, not glass) in plastic wrap and foil before placing it in the freezer for up to two months. To bake a frozen ham pot pie, remove it from the freezer 30 minutes prior to baking. Bake it at 375˚F for 45-60 minutes until the crust is golden brown and the filling is hot.