Cook and stir beans, mushrooms and onions in same skillet 6 to 8 min. or until crisp-tender. Sprinkle with flour; cook and stir 1 min. Stir in broth; simmer 3 min. or until thickened, stirring frequently. Add cream cheese product; cook and stir 2 to 3 min. or until melted. Spoon over chicken; top with stuffing. Refrigerate up to 24 hours.