Preheat the air fryer to 180°C.
Cut each sweetpotato into 3 to 5 mm fan-like slices, leaving the base intact so the slices stay connected.
In a mixing bowl, combine the olive oil, Italian herbs, garlic powder, salt and black pepper.
Place the sweetpotatoes in the air fryer and cook for 5 minutes.
Open the air fryer and, using a brush, apply the seasoning mixture between the slices and over the tops of the sweet potatoes.
Cook for a further 20 minutes or until the sweet potatoes are golden and tender. Serve warm.