Mash the potato, then add the leek along with one beaten egg, salt and black pepper and a large handful of grated cheese.
Take scoops of the potato mixture, form into sausage shapes and roll in the breadcrumbs until fully covered.
Chill for at least half an hour.
Spray with oil and place in the air fryer.
Cook at 200˚C for 5 minutes.
Turn carefully and cook for 5 minutes more.
Spray with oil and place in the air fryer.
Cook at 200˚C for 5 minutes.
Turn carefully and cook for 5 minutes more.