I got this recipe out of Capper’s Weekly. Very good the next day.

6 potatoes (2 1/2 lbs.)
3/4 C. water
1 stick margarine
1 pkg. dry onion soup mix

Cut unpeeled potatoes into 1/2″ slices. Melt margarine in water. Add soup mix. Layer the potatoes in a 2-quart casserole. Bake, covered, in 350º oven for 1 hour. Will hold indefinitely in warm oven.