Peel sweet potatoes and cut into fries approximately ¼ inch thick. Pat the fries dry with a paper towel.
Preheat air fryer to 360°F (180°C).
Mix the olive oil, salt, pepper, and optional seasoning in a large bowl. add the sweet potato fries and toss to coat.
Place sweet potato fries in the air fryer and cook for 10-15 minutes, shaking the basket every 5 minutes to redistribute the fries so they cook evenly.
Air fry sweet potato fries until they are golden brown and tender. If you want them crisper, cook for another 5 minutes or until cooked to your liking.