With potatoes left over for dinner, a very cheap and nourishing dish can be obtained. Slice some cold potatoes and pile them roughly in a pie dish. Beat up an egg, add on teacupful of milk, and into this stir two tablespoons each of flour, breadcrumbs and grated cheese. Season with salt and pepper. Pour over the potatoes, dot with margarine and bake in a good oven until nicely browned.