Cheeseburger Casserole

Cheeseburger Casserole 1 lb ground beef 1/2 cup chopped onion 2 cups water 2/3 cup ketchup 1 (8 ounce) can tomato sauce 2 tablespoons prepared mustard 1 teaspoon salt 1/4 teaspoon pepper 2 cups uncooked instant rice 1 cup shredded cheddar cheese Preheat skillet to 300°F. Place ground beef and onion in skillet and cook until beef is no longer pink. Add water, ketchup, tomato sauce, mustard, salt and pepper. Mix well and bring to a boil. Add rice and mix thoroughly. Cover, and reduce temperature to 200°F Let stand 5 minutes. Top with cheese; cover and let stand 5 minutes more.