Prepare the Alfredo Sauce as directed, except reserve 2 tablespoons of freshly grated Parmesan cheese, set aside. Cook and drain linguine as directed on package. While linguine is cooking, spray a 10 inch skillet with nonstick cooking spray. Cook chicken, mushrooms and onion in skillet over medium heat 5 to 7  minutes, stirring occasionally, until the chicken is no longer pink in center. Stir in Alfredo Sauce. Toss linguine and chicken mixture. Sprinkle with reserved cheese and the parsley. Makes 6 servings