Drain chickpeas and transfer to a bowl. Use a fork to roughly mash the beans. Set aside.
Combine basil, parsley, chives, garlic, lemon zest and juice, yogurt, pinch of salt and pepper in bowl of food processor. Pulse to desired consistency.
Pour herb sauce over mashed chickpeas. Taste and adjust add more salt and pepper, if needed. Add celery and red onion and fold in to thoroughly combine.
Toast slices of bread, if desired.
Spoon chickpea mixture onto toast and top with additional chopped herbs, microgreens or avocado, if desired. Serve immediately.