In a large bowl, combine sweet potatoes, olive oil, kosher salt, and black pepper. Toss until the sweet potatoes are evenly coated.
Working in batches, arrange the sweet potato sticks in a single layer in the basket of your air fryer.
Air fry at 350°F for 16–18 minutes, flipping the fries or shaking the basket halfway through, until the fries reach your desired crispness.
Serve immediately with your favorite dipping sauce.