COOK onions in dressing in large saucepan until tender.

ADD broth, water and broccoli. Bring to boil; cook 8 to 10 min. or until broccoli is tender. Stir in milk and rice. Reduce heat to medium; cook 5 min.

POUR into blender or food processor container in batches; cover. Blend until smooth. Return to saucepan; cook on low heat until heated through. Top each serving with cheese.