Preheat the Air Fryer: Set the air fryer to 400°F (200°C) and preheat for about 3-5 minutes.
Prepare the Hash Browns: If using frozen diced hash browns, no need to thaw them. In a mixing bowl, toss the diced hash browns with oil (if using) and your choice of seasonings (salt, pepper, garlic powder, etc.).
Load the Air Fryer: Place the seasoned diced hash browns in the air fryer basket in a single layer. Make sure not to overcrowd them to allow the air to circulate for even cooking.
Cook the Hash Browns: Air fry at 400°F (200°C) for 10-15 minutes, shaking the basket halfway through to ensure even crisping. Adjust the cooking time depending on your desired level of crispiness.
Serve: Once the hash browns are golden brown and crispy, remove them from the air fryer and serve immediately. You can top them with sour cream, chives, or any other favorite toppings.