In a large mixing bowl, combine the chickpeas, diced cucumber, diced bell pepper, chopped red onion, halved cherry tomatoes, and chopped parsley or cilantro. Season with salt and pepper to taste. Toss until well combined.
In a blender or food processor, combine the flesh of the avocado, Greek yogurt, lemon juice, olive oil, minced garlic, ground cumin, salt, and pepper. Blend until smooth and creamy. If the dressing is too thick, add water, a tablespoon at a time, until desired consistency is reached.
Pour the avocado dressing over the chickpea salad and toss until the salad is evenly coated with the dressing.
Taste and adjust seasoning if necessary.
Serve the chickpea salad immediately, or chill in the refrigerator for about 30 minutes to allow the flavors to meld together.
Enjoy as a light and refreshing meal on its own, or serve as a side dish alongside grilled chicken, fish, or tofu.