Wash and clean the mushrooms and oyster mushrooms. Halve the mushrooms, leave the oyster mushrooms whole or cut into pieces, depending on their size. Peel and chop onion. Dice salami as well.
Heat the fat in a large frying pan, fry the mushrooms and onion in it while turning. Finally add salami and fry briefly. Season with salt and pepper and dust with flour. Add stock and cream, bring to the boil and simmer at low heat for 4-5 minutes.
Stir from time to time.
Place the gnocchi in plenty of boiling salted water, cook according to the instructions on the packet and drain on a sieve. Season mushroom sauce with salt, pepper and nutmeg. Fold in parsley and gnocchi and place in an ovenproof dish.
Sprinkle with cheese and gratinate under the preheated grill for 5-10 minutes.