1. Bring a large pan of water to the boil. Add the potatoes, return to the boil and cook for 8 mins. Drain well and return to the dry pan.
2. Preheat the air-fryer to 200°C.
3. Shake the pan to roughen the edges of the potatoes, then add the rosemary and garlic. Drizzle over the oil and sprinkle with salt, then shake to coat.
4. Tip into the air-fryer basket and cook for 18-20 mins, shaking after 10 mins, until golden brown at the edges. Serve hot.
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