COOK chicken in hot oil in large skillet on medium heat 8 min. or until chicken is browned on all sides, turning occasionally. Remove from skillet. Drain skillet, reserving 1 Tbsp. drippings in skillet.
ADD onions to skillet; cook and stir 1 min. Return chicken to skillet; add tomatoes. Cover. Simmer on low heat 25 min. or until chicken is done (165ºF).
TOP with cheese and parsley.