Combine chickpeas, parsley, garlic, onion, cumin, coriander, baking powder, salt, and pepper in a food processor. Pulse until a coarse dough forms.
Transfer mixture into a bowl and stir in flour. Form into 12 small patties.
Preheat air fryer to 375°F (190°C).
Brush patties lightly with olive oil and place in the air fryer basket in a single layer.
Air fry for 10 minutes. Flip and continue cooking for another 10-12 minutes until golden and crisp.
Whisk together tahini, water, lemon juice, salt, and pepper in a small bowl. Adjust water for desired consistency.
Serve falafel hot with tahini sauce on the side.