Slice each potato 3/4 of the way through vertically (slice thinly like an accordion.)
Roll potatoes in combination of oil and butter.
Put potatoes in a shallow pan.
Pour remaining butter over potatoes.
Season with salt and pepper.
Bake at 375 degrees for 2 hours, basting with butter.
Sprinkle cheese over potatoes and bake until cheese melts.
Yield: 6-8 servings.