BLEND tomato sauce and cream cheese in blender until smooth.
HEAT dressing in large skillet on medium-high heat. Add chicken and onions; cook 8 min. or until chicken is evenly browned, stirring occasionally. Add tomato sauce mixture and all remaining ingredients except parsley; stir. Simmer on medium heat 5 min. or until chicken is done, stirring occasionally.
STIR in parsley.