Boil the potato, peel and cut into thin slices, cut the onion into rings and roast. Cut the extra sausage into slices. Mix eggs and milk.
Take a baking dish, butter in.
First place a layer of potato in a flake shape, season with salt, then a lot of roasted onion, on top of which also lay the extra sausage in a flake shape, top with cheese slices, season with pepper, then a lot of fried onion.
Then there is another layer of potato, onion, cheese, onion and finally the potato, on which the egg milk is poured and finally a handful of parmesan is mixed with breadcrumbs.
Don`t forget to salt the potato and pepper the cheese.
In the tube at about 180 ° / 200 ° for about 45 minutes.