Cook rotini according to package directions. Drain.
Meanwhile, combine green pepper, ground beef and onion in 10-inch skillet. Cook over medium heat, stirring occasionally, until ground beef is browned (5 to 8 minutes). Drain off fat.
Stir in cooked rotini and all remaining ingredients except cheese. Cover; cook over low heat, stirring occasionally, until heated through (8 to 10 minutes).
Stir in 1 cup cheese until melted (2 to 3 minutes). Sprinkle with remaining cheese.