Cheese Roasted Potatoes

1 hour and 20 min. before: Cut each potato from 4 baking potatoes, peeled, crosswise into 4 thick slices, about 3/4 way through. Place in greased baking dish; sprinkle with 1/4 tsp. salt. Cover with foil; bake 55 min. at 400F. Reduce oven temperature to 350F. Place half slice cheese from 2 slices American cheese over each potato. Bake, uncovered, 15 min. or until tender. Serves 4.