COOK chicken in hot oil in large covered skillet on medium-high heat 4 min. on each side or until each breast is evenly browned on both sides.
MIX dressing, broth, onions and seasoning until blended; pour over chicken. Bring just to boil; simmer on medium-low heat 3 min. or until chicken is done (165ºF).
ADD broccoli and cheese; mix well. Cook 2 to 4 min. or until broccoli is crisp-tender, stirring occasionally.