In blender or food processor, place cucumber, avocado, yogurt, lime juice, vinegar, sugar and salt. Process until well blended, 1 minute.
Cover and refrigerate until well chilled, 2-4 hours.
For each serving in one bowl, add the following: 8 oz (1 cup) soup. Top with 1 Tbsp cucumber, 1 tsp cilantro, 1 tsp chipotle pepper, small dollop nonfat plain Greek yogurt. Serve.