Cook chicken in dressing in large skillet on medium heat 2 min. Add Neufchatel; cook and stir 3 to 5 min. or until melted. Stir in flour until well blended. Add broth and vegetables; stir. Simmer 5 min.
Pour into 10-inch deep-dish pie plate; cover with pie crust. Seal and flute edge. Cut slits in crust to permit steam to escape.