Preheat oven to 400 F. Chop onion and bell pepper. Cook and stir ground beef, onion, and bell pepper over medium heat 8-10 minutes or until beef is no longer pink; drain. Stir in chili beans, barbecue sauce and salt. Bring to boil. Spoon int 9" square baking pan. Prepare corn muffin mix according to package directions; stir in corn. Spoon over meat mixter. Bake 30 minutes or until golden brown.