Pre-heat the air fryer at 400°F for 5 minutes.
Soak the yellow moong dal for at least an hour.
Next, take the soaked moong dal, ginger and green chilies and blend into a smooth paste. Avoid adding any water. If the paste is too thick then just add a tiny amount of water.
Transfer the paste into a bowl. Add the remaining ingredients and mix well. The mixture should be thick enough to hold shape. If required, add more chickpea flour.
Spray the air fryer basket with oil. (Optional)
Make roundels of the mixture and transfer them to the air fryer basket. Make as many as you can.
Cook them at 350°F for 12-15 minutes or until the skin gets golden brown with textures.
Keep flipping them once or twice in between and brush some oil so that the skin gets heat evenly from all sides.
For the last 1 minute cook them at 400°F so that the exteriors of the vadas are crispy.
For the chutney, blend all the ingredients into a smooth paste.
Serve moong dal vadas hot with green chutney.