COOK mushrooms in 1 Tbsp. butter in large skillet on medium heat 5 min. or until tender; set aside. Add remaining butter to large saucepan on medium heat. Add flour; cook and stir 8 to 10 min. or until mixture forms smooth paste.
ADD broth gradually to flour mixture, stirring constantly; cook on medium heat 5 min. or until broth is thickened, stirring frequently. Stir in cooked mushrooms and cooking creme; cook 2 to 3 min. or until heated through, stirring frequently. Season with pepper.
SERVE topped with chives and bacon.