Drain and rinse the chickpeas thoroughly. Pat them dry with a clean kitchen towel to remove excess moisture.
Finely chop the red onion. Halve the cherry tomatoes. Peel, seed, and dice the cucumber. Halve the Kalamata olives.
In a small bowl or jar, whisk together the olive oil, lemon juice, minced garlic, and dried oregano until well combined. Season with salt and pepper to taste.
In a large mixing bowl, combine all prepared ingredients: chickpeas, red onion, cherry tomatoes, cucumber, Kalamata olives, feta cheese, parsley, and mint. Pour the dressing over this mixture and gently toss everything together.
Serve immediately or chill in the refrigerator for later enjoyment. Garnish with extra feta and fresh herbs before serving.