Gently toss potatoes with salt and pepper. Layer a third of potato slices, circular fashion, around bottom and side of skillet. Dot with butter. Repeat twice.

Over high heat, cook potatoes 3 minutes. Then bake, covered, 30 minutes. Place sheet of foil under skillet to catch any overflow. Remove cover and broil until lightly brown. Let stand 5 minutes. Invert on serving platter. Makes 6 servings.