COOK onions in butter in medium saucepan on medium heat 4 min. or until onions are crisp-tender, stirring frequently. Add flour; cook and stir 1 min.
ADD broth gradually, then milk, stirring constantly until blended. Stir in broccoli; bring to boil. Simmer on medium-low heat 5 min. or until soup is heated through. Add, in batches, to blender; blend until smooth. Return to pan. Stir in pepper.
WHISK in cooking cream; simmer 2 to 3 min. until heated through, stirring constantly.