Preheat the air fryer to 400F.
Then, once preheated add the frozen French fries in to the air fryer basket. About one handful or one serving at a time to not crowd the French fries.
Cook the French fries for 6 minutes then shake the basket. Replace, then cook another 6 minutes. The fries should be hot and crispy now. Serve and eat with caution because the insides will be hot.