When I make gravy, meat, or saute' or cube vegetables; I make extra to put in a pie shell or a casserole the next day. I will cook everything and remove a couple of cups of hash-browns and vegetables when they are partially cooked, so I can put them in a one pot dish the next day and finish cooking them. This saves a lot of time in preparing meals and there is less clean up.
One of the small cardboard pie containers will hold 1 level cup of vegetables. I combine what vegetables I have on hand to make about 1 1/4 cups of filling, (vegetables, cheese, scrambled egg, bacon, gravy).
1 - 2 Baking potato's
Mushrooms ( Saute')
I save what few store bought pie containers I have to make homemade pot pies.