* If desired, prepare instant mashed potato flakes according to package directions, omitting margarine and salt.
TO FREEZE: Cover each unbaked casserole with cover or plastic wrap; wrap in heavy-duty foil. Label with recipe name, date and reheating directions; place in freezer.
TO THAW: Place pie in refrigerator overnight. Or remove foil and plastic wrap and microwave 1 pie on MEDIUM for 9 to 12 minutes (12 to 16 minutes for 2 pies) or until thawed, gently breaking apart center with fork.
TO REHEAT IN MICROWAVE: Cover 1 thawed pie and microwave on MEDIUM-HIGH for 3 to 5 minutes (4 to 8 minutes for 2 pies) or until thoroughly heated.
TO REHEAT IN OVEN: Bake thawed pie(s), uncovered, at 400°F. for 25 to 30 minutes or until thoroughly heated