In A 10-In. Nonstick Skillet, Saute Potatoes, Onion And Green Pepper In Butter Until Tender. Sprinkle With Ham. In A Bowl, Beat Eggs, Milk, Pepper And Salt; Add To The Skillet. As The Eggs Set, Lift Edges, Letting Uncooked Portion Flow Underneath. When Eggs Are Set, Remove From The Heat. Sprinkle With Cheddar Cheese; Fold Omelet In Half. Cover; Cooked For 1-2 Minutes Or Until Cheese Is Melted.