01 - Cut sweet potatoes into ¼-inch thick fries.
02 - Soak fries in cold water for 30 minutes to remove excess starch, then drain and pat dry thoroughly with paper towels.
03 - In a large bowl, toss fries with olive oil. If using, sprinkle with cornstarch and toss until evenly coated.
04 - Add sea salt, smoked paprika, garlic powder, and black pepper, then toss again to distribute evenly.
05 - Preheat the air fryer to 380°F (193°C) for 3 minutes.
06 - Place fries in a single layer in the air fryer basket, working in batches if necessary to avoid overcrowding.
07 - Air fry for 16 to 18 minutes, shaking the basket halfway through cooking until fries are golden and crispy.
08 - Optionally sprinkle with additional salt and serve immediately with preferred dipping sauces.