Pour chickpeas into the basket of a large air fryer. Cook at 220 degrees F (104 degrees C) until mostly dry, about 15 minutes. Check after 10 minutes of cooking; all liquid should be evaporated and chickpeas should still be squishy, not toasted or hardened. Turn air fryer off.
Transfer chickpeas to a food processor. Add onion, cilantro, parsley, almond flour, garlic, cumin, cayenne, baking powder, salt, pepper, baking soda, and nutmeg. Process on medium-high speed until a chunky paste forms.
Refrigerate mixture to let flavors develop and to enable more drying, at least 30 minutes, or up to 1 hour.
Form mixture into 1 1/4-inch balls. Place in the air fryer basket and spray with sesame oil spray; be careful, falafel will be delicate.
Set the air fryer to 320 degrees F (160 degrees C) and cook for 10 minutes. Coat with more sesame oil if desired, increase temperature to 350 degrees F (175 degrees C), and cook until outsides are toasted, about 10 more minutes.