Cook the tagliatelle according to the instructions on the packet.
Melt the butter in a pan, cut the onion and garlic into small pieces and sauté in them until translucent. Cut the mushrooms into slices, add and fry briefly. Add the spinach, add the wine and simmer briefly. Add a good dash of cream until you have the desired consistency. Season with nutmeg, salt and pepper and bring to the boil again.
Add the tagliatelle, mix everything well and finally sprinkle the parmesan on top.