Preheat an air fryer to 400 degrees F (200 degrees C) according to manufacturer's instructions.
Place sweet potato in a large bowl. Drizzle with olive oil, then add brown sugar, salt, chili powder, paprika, cayenne pepper, onion powder, and pepper. Stir until potatoes are evenly coated and spread out onto the air fryer rack.
Cook on the upper rack of the preheated air fryer until browned and crispy, 15 to 20 minutes.