Find recipes for Cheeseburger Casserole and other Course recipes. Get all the best recipes at . Recipe directions: In a skillet over medium heat, brown the beef and onion; drain. Add water, ketchup, mustard, salt and pepper; mix well. Bring to a boil. Stir in rice. Cover and remove from the heat; let stand for 5 minutes. Top with cheese; cover and let stand for 3-5 minutes or until cheese is melted.