01 - Slice peeled sweet potatoes into uniform 1/4-inch thick batons. Transfer to a large bowl, cover completely with cold water, and soak for 30 minutes to remove excess starch for optimal crispiness.
02 - Drain soaked potatoes thoroughly and pat completely dry using paper towels. Toss with olive oil until evenly coated, then sprinkle with cornstarch, smoked paprika, garlic powder, salt, and pepper. Mix until all pieces are uniformly seasoned.
03 - Set air fryer to 400°F and allow to preheat for 3 minutes before adding potatoes.
04 - Arrange potatoes in a single layer without overcrowding the basket. Cook for 15-18 minutes, shaking the basket vigorously halfway through cooking time, until exterior is golden brown and crispy.
05 - Transfer fries to serving platter and season with additional salt if desired. For best texture and flavor, serve hot with preferred dipping sauce.