Combine chicken or vegetable stock, cucumbers, Greek yogurt, avocado, shallot, fresh dill, lime juice, ground cumin, and salt in a blender or food processor.
Blend until the mixture is completely smooth. If a thinner consistency is desired, gradually add more stock until it reaches your preference.
Transfer the soup to an airtight container and refrigerate for at least 2-3 hours to allow the flavors to meld and the soup to chill thoroughly.
Before serving, taste the soup and adjust seasonings as needed.
Serve the chilled soup in bowls, garnished with fresh dill sprigs and thin cucumber slices. Add a sprinkle of black pepper if desired.
Notes
Nutrition information is an estimate, calculated automatically. Values vary with brands, substitutions and portion sizes.