Baked Potato Casserole

Source: Gourmet on Wheels, Harriett Barker

3 large raw unpeeled potatoes, cubed
2 tablespoons melted butter
1/2 teaspoon garlic salt
1 teaspoon seasoned salt
1 tablespoon vinegar
Dash pepper

Toss all in 1 1/2-quart casserole. Cover with foil. Cut vents. Bake at 350 degrees F for 45 minutes or until tender.