In a bowl, mix chicken, vegetables, soup, and milk. Roll one of the crusts out to the size of the 9 x 13 baking dish and place in the bottom of the dish. Pour mixture in dish. Roll second crust to 9 x 13 and place on top of mixture. Cut several slits in top crust to allow for venting. Bake at 425 for about 45 minutes or until crust is lightly browned.
To make a Beef pot pie, use canned beef instead of chicken, and brown gravy mix and 1 cup beef broth instead of the cream of chicken soup and milk.