This turkey pie is easy, and it's a great way to use leftover meat. The recipe can be made even easier with purchased gravy and a ready-made pie crust sheet. Or use the buttery homemade crust included in the recipe. This is a nice meal to make ahead, too. Make the turkey filling the day before and refrigerate it until baking time. Just top it off with the prepared sheet of pie pastry and bake. You can use an egg white wash and sesame seeds on the turkey pie or, for a softer crust with deeper color, make the egg wash with a whole egg and 1 tablespoon of water.