Clean the mushrooms, peel and finely dice the onion. Sauté the onion cubes in the melted butter until translucent, add the mushrooms and fry over a medium heat.
Add the vegetable stock and simmer for about 20 minutes with the pan closed.
In the meantime, cook the noodles al dente.
Refine the mushroom sauce with the cream and parsley and serve with the pasta.