Pre-soak diced potatoes in cold water for a minimum of 30 minutes. Drain water from the potatoes and pat dry.
Preheat air fryer to 370 (approximately 5 minutes).
Drizzle potatoes with oil or spray evenly with cooking spray. Season potatoes with salt, garlic powder, onion powder, and pepper. Add potatoes to the air fryer basket.
Cook potatoes for 10-15 minutes at 370 degrees. Open fryer basket and shake up potatoes to re-distribute them evenly. Cook an additional 10-15 minutes.
Notes
Prep time includes the 30 minutes the potatoes soak in water.