Prepare the chickpeas:
Drain and rinse the chickpeas well under cold water. Allow them to drain completely, then pat them gently with paper towels to remove excess moisture. Chop the vegetables:
Dice the cucumber and red bell pepper, halve the cherry tomatoes and olives, and finely slice the red onion. Make the dressing:
In a small bowl or jar, combine the olive oil, lemon juice, garlic, oregano, Dijon mustard, salt, and black pepper. Whisk or shake until well combined. Assemble the salad:
Add the chickpeas, cucumber, tomatoes, bell pepper, red onion, olives, parsley, and mint to a large mixing bowl. Add dressing and feta:
Pour the lemon dressing over the salad and toss gently until everything is evenly coated. Add the crumbled feta and fold it in carefully. Chill and serve:
Let the salad rest for 10–15 minutes before serving so the flavors can blend. Serve chilled or at room temperature.