First, preheat the air fryer to 400℉.
Now, once the air fryer is up to temp, place a layer of frozen sweet potato fries in the basket. Do not crowd them but you should get a least a serving and a half with a normal size air fryer.
Place the basket back in then set the time to 15 minutes.
Then, you are going to want to give the basket a good shake every 5 minutes. The water from the frozen fries will make the sweet potato try to to stick. Shaking allows the release before all the water has evaporated.
After, the shake at 10 minutes gauge how done the fries are. Depending on the power of your air fryer that extra 5 minutes may be too much and you only need 3 minutes to finish the fries.