Cook and drain spaghetti as directed on package--except omit salt.
Meanwhile, in 3-quart saucepan, cook asparagus, tomatoes, garlic, bell pepper, onion and broth over medium heat 5 minutes. Stir in chicken. Cook 2 to 3 minutes, stirring constantly, until asparagus is crisp-tender and chicken is no longer pink in center.
Stir in spaghetti and remaining ingredients. Toss about 30 seconds or until thoroughly heated.