Place the grated potatoes in a clean kitchen towel and squeeze out as much excess moisture as possible. Transfer the potatoes to a large mixing bowl.
Add the grated onion to the potatoes.
In a small bowl, combine the ground flaxseed and water. Stir well and let it sit for 5 minutes to thicken, creating a flax egg.
Add the flax egg, chickpea flour, salt, black pepper, and baking powder to the potato and onion mixture. Mix thoroughly until well combined.
Preheat the air fryer to 375°F (190°C) for 3 minutes.
Form the potato mixture into small patties, about 3 inches in diameter and 1/2 inch thick.
Brush both sides of each latke with olive oil.
Arrange the latkes in a single layer in the air fryer basket, making sure they do not overlap. You may need to cook them in batches.
Air fry the latkes at 375°F (190°C) for 10 minutes. Then, carefully flip each latke and air fry for an additional 10 minutes or until both sides are golden brown and crispy.
Remove the latkes from the air fryer and place them on a paper towel-lined plate to absorb any excess oil.
Serve hot with your favorite vegan sour cream or applesauce.