Cut: To cut traditional fries, cut your sweet potato lengthwise into thin planks, and cut each plank into strips. To cut sweet potato wedges, cut your sweet potato in half lengthwise. Cut in half lengthwise again, then cut each of those halves in half again. (Each potato should make 8 wedges, though you can cut them down smaller if your sweet potato is large).
Soak: Soak fries in cold water for 30 to 60 minutes (or as long as 8 hours) before air frying*.
Dry: Drain and pat dry sweet potato wedges. Add to a bowl, then drizzle with vegetable oil (about 1 teaspoon per potato) and a pinch of salt, tossing to coat.
Air Fry: Add fries to your air fryer, spread out in as single of a layer as possible. Cook at 390°F (200°C) for 15 to 20 minutes, shaking every few minutes to evenly cook.