COOK chicken and onions in large skillet sprayed with cooking spray on medium heat until chicken is cooked through, stirring occasionally.
STIR in soup and water; bring to boil. Stir in rice and broccoli. Reduce heat to low; cover. Cook 5 to 10 min. or until broccoli is tender.
ADD 3/4 cup of the cheese; stir. Top with remaining cheese.