01 - Cut peeled sweet potatoes into ¼-inch thick fries.
02 - Soak the cut fries in cold water for 30 minutes to eliminate excess starch, then drain and pat completely dry with paper towels.
03 - In a large bowl, toss the dried fries with olive oil. Optional: sprinkle cornstarch over fries and toss to coat evenly.
04 - Add sea salt, smoked paprika, garlic powder, and black pepper to the fries. Toss until the seasoning is uniformly distributed.
05 - Set the air fryer to 380°F and preheat for 3 minutes.
06 - Place fries in a single layer inside the air fryer basket; cook in batches if necessary to avoid overcrowding.
07 - Cook fries for 16 to 18 minutes, shaking the basket halfway through, until fries are golden, crisp, and cooked through.
08 - Sprinkle with additional salt if desired and serve immediately.