In a deep skillet or Dutch oven, bring broth to boil over high heat; add frozen chicken breasts. Return to a boil, reduce heat, cover and simmer 16 minutes.
Add pasta, stir, cover and simmer 8 minutes, stirring occasionally. Remove chicken, cool and shred.
Increase heat to high and bring pasta to a boil. Add frozen vegetables, return to a boil, reduce heat, cover tightly and simmer 5 minutes or until vegetables are crisp tender.
Drain pasta mixture, reserving 1/2 cup of the pasta cooking water. Return pasta to skillet and place over medium heat. Add cream cheese, salt and reserved cooking water. Toss until cheese has melted. Add chicken, and cook 2 minutes to heat through, stirring frequently. Sprinkle with Parmesan cheese, green onions and black pepper.