COOK noodles as directed on package, omitting salt.
MEANWHILE, heat 1-1/2 tsp. oil in large skillet on medium-high heat. Add chicken; cook 4 to 5 min. on each side or until done. Transfer to plate; cover to keep warm.
MIX cream cheese spread, milk and garlic powder until blended. Add remaining oil, mushrooms and onions to skillet; cook on medium heat 7 min. or until mushrooms release most of their liquid, stirring occasionally to scrape browned bits from bottom of skillet. Add cream cheese mixture and broth; cook and stir 3 to 5 min. or until cream cheese is completely melted and sauce is heated through.
DRAIN noodles; place on platter. Top with chicken, cream cheese sauce and parsley.