Rinse and drain the chickpeas, then pat them dry with a clean towel so the dressing clings.
In a large bowl, combine the chickpeas, halved tomatoes, diced cucumber, sliced red onion, crumbled feta and chopped parsley.
In a small bowl or jar, whisk together the olive oil, lemon juice, minced garlic, oregano, salt and pepper.
Pour the dressing over the salad and toss gently until everything is evenly coated.
Serve right away, or refrigerate 20 minutes to let the flavors meld. Store in an airtight container up to 4 days.