Preheat oven to 350 degrees. In a medium skillet, heat oil and cook potatoes and green peppers covered 7 minutes. Cool slightly; stir in cheese. In a medium bowl, combine onion-mushroom recipe soup mix with water; add remaining ingredients, mixing thoroughly. In a shallow baking pan, shape 1/3 beef mixture into a rectangle (about 8' x 4'); top with potato mixture. Cover with remaining beef mixture, shaping into a loaf and sealing edges tightly; bake 1 hour or until done. Serve, if desired, with Onion-Mushroom Cheese Gravy.
In a medium saucepan, combine 1 envelope Lipton Onion-Mushroom Recipe Soup Mix with 2 tablespoons all-purpose flour. Stir in 1-3/4 cups water; blend until smooth. Bring to a boil, then reduce heat and stir in 1/2 cup shredded Cheddar cheese. Simmer, stirring frequently, until gravy thickens, about 5 minutes. Makes about 2 cup gravy.