Cook and drain pasta as directed on package. Meanwhile, in 12-inch nonstick skillet, cook beef and onion over medium heat 8 to 10 minutes, stirring occasionally, until beef is thoroughly cooked; drain.
Stir in pasta sauce, corn, salt and cooked pasta. Cook until hot. Sprinkle with cheese; let stand 2 to 3 minutes or until melted. Sprinkle with green onions.