Add flour to a bowl, add softened butter and rub with fingers until breadcrumbs form.
Add baking powder, sugar, 1 egg and mix with hands. Add small amounts of milk at a time to form a dough. Transfer to a dusted surface and knead for 2 mins.
Cut into 6 large or 12 small equal parts. Transfer on to a greased tray and glaze with egg wash.
Bake in the HYSapientia air fryer oven at 180 degrees for 20 minutes.