In a saucepan, combine zucchini, chicken broth, scallions, salt, pepper and dill. Cook mixture until soft (approximately 20 to 30 minutes).
Combine cream cheese and sour cream in a blender or food processor until smooth. Add zucchini mixture, a portion at a time, and process until smooth. Chill overnight or until very cold. Garnish with chopped chives or paprika.