It’s the day after Thanksgiving, and you have all those leftovers from Thursday’s big dinner. This pie makes use of more than just leftover turkey. Use a medley of leftover vegetables along with the mashed potatoes, turkey and gravy, topped with a parmesan cheese, ready in only an hour.You still have some great fresh herbs laying around? Add the fresh herbs on there like oregano, rosemary, sage, thyme, or parsley. I made this pie yesterday and its already gone..