As a child we always went apple picking. We would fill the trunk of the car on a saturday, and spend all day sunday making pies for the freezer. Mom always froze them unbaked and they came out wonderful. She would just take the sliced apple, sugar, cinnamon and flour and toss it together toss in a crust, dot with butter, and put the top crust on, wrap it and in the freezer it went!
It was so great having hot apple pie all through the winter without having to make it, just bake it!
She always used the foil pans and they worked fine, although our old oven browned the bottom of anything really well, at times too well, LOL!