Potatoes Supreme
["6 medium potatoes, cooked and peeled", "1/2 c. melted butter", "2 c. shredded Cheddar cheese", "1/3 c. chopped onion", "1 pt. sour cream", "1/4 tsp. salt"]
["Cook potatoes in small amount of salted water until tender. Drain and refrigerate overnight (covered).", "Grate cold potatoes coarsely.", "Mix in remaining ingredients and bake in a shallow pan at 350\u00b0 for 35 minutes."]
["potatoes", "butter", "Cheddar cheese", "onion", "sour cream", "salt"]