Mix. Add the chickpeas to a large mixing bowl and lightly mash them with the back of a fork. To the bowl, add the celery, carrot, cucumber, radish, green onion, olives, parsley, and mint. Season with a big pinch of salt and pepper and toss gently to combine.
Dress. Add as much of the dressing as you like, making sure you coat all the chickpeas and veggies well. Toss to combine.
Serve. Spoon the chickpea mixture over 4 of the toasted bread slices and top with the remaining 4 slices of bread. Enjoy!
