HEAT oil in large saucepan on medium heat. Add onions; cook and stir 5 min. or until tender.
STIR in broccoli, potatoes, broth, water and pepper. Bring to boil; simmer on medium-low heat 15 min. or until vegetables are tender.
BLEND soup, in batches, in blender until smooth. Return to pan. Mix remaining ingredients until blended; whisk into soup. Cook and stir 2 to 3 min. or until heated through.