I made one big casserole that we ate last night.
And 2 individual casseroles to put in the freezer. It will be interesting to see how it freezes. The biggest issue really is reheating it so the crust stays firm. It will have to be in the oven.
If you don't have leftover cooked turkey in the freezer, no need to buy the pre-packaged stuff. Just bake extra the next time you bake some chicken or buy parts and bake them up for the leftovers. That way you control the salt and seasonings. Plus you can make gravy out of the pan drippings! Your half way to a chicken pot pie already!