How to make
Heat the oil and braise the onions and garlic. Add the cleaned and chopped mushrooms and parsley and braise. Once the liquid evaporates, add the flour and stir. Pour in the wine and broth, stir.
Season with salt and black pepper and bring to a boil. Keep stirring until the sauce thickens. In the meantime, boil the spaghetti in salted water. Mix them with the sauce and serve.