1. Combine all the ingredients except the American cheese, in a deep,1 1/2-quart, heat-resistant, non-metallic, casserole. 2. Heat,covered, in Microwave Oven 15 minutes or until potatoes are tender.Stir occasionally. 3. Top casserole with cheese slices and heat,uncovered, in Microwave Oven an additional 30 seconds or just untilcheese melts.