For Pommes Duchesses from the hot air fryer, first peel the potatoes and boil or steam them in salted water until soft. Drain and press through a potato ricer.
Mix with remaining ingredients until smooth, but do not stir too much.
Pour into a piping bag. Grease the griddle of the Philips Airfryer hot air fryer and squirt the potato mixture onto it. Whisk the egg and brush the potato fritters with it.
Bake the pommes duchesses in the Philips Airfryer hot air fryer for about 10-13 minutes at 180 °C.