In a large mixing bowl add the tuna, chickpeas, cucumber, tomato, celery, onion, capers, olives and parsley.
In a small mixing bowl, add the yogurt, oil, lemon juice, mustard, garlic, salt and pepper. Mix well to combine.
Pour the dressing over the salad ingredients and mix well to coat everything.
Transfer to serving bowls and top with the feta.
Notes
To make this high protein chickpea tuna salad even quicker, you could use a vegetable chopper to chop everything up.
The leftovers might lose a bit of flavor over time, but you can just add a squeeze of lemon juice to it all and some extra fresh herbs and it really brings it all back to life.