Halve the onions and cut the halves into strips approx. 0.5 cm thick. Then fry them in a little butter or olive oil. Meanwhile, peel the apples and cut them into small pieces. The onions can get a little color. When the onions are a little browned, add the apples, dust with a heaped tablespoon of flour, add the cream, white wine and calvados and bring to the boil briefly. Season with salt, pepper and a little nutmeg or simply with a little granular broth. It can have a strong taste (but please don`t over-salty) because the meat also needs a little salt.
Put the meat in a baking dish and pour the onion sauce over it. Cook at 180 degrees in a preheated oven for about 30 minutes until a nice brown crust has formed.
Rice or boiled potatoes or bread dumplings go well with it.
I calculate half a chicken breast or a schnitzel per person.