1. Heat oven to 350°F. Brown ground beef with onion in large nonstick skillet over medium heat 8 to 10 minutes or until beef is not pink. Pour off drippings.
2. Stir in Sloppy Joe sauce, pasta and 1/2 cup water. Transfer to greased 13" x 9" baking dish. Bake, covered, in 350°F oven 35 to 40 minutes or until pasta is tender. Top with cheese. Bake, uncovered, 5 minutes or until cheese is melted. Let stand 5 minutes.