Soak porcini mushrooms in cold water for about 10 minutes. In the meantime wash thyme, dab dry and pluck. Clean the mushrooms, possibly wash them and cut them into thick slices. Drain the porcini mushrooms and collect the soaking water.
Cook the pasta in boiling salted water for about 8 minutes. In the meantime, peel and finely dice the onion. Heat the oil in a pot and fry the mushrooms in it. Add thyme and fry briefly.
Remove the mushrooms and put them aside. Sauté onion in the frying fat and deglaze with white wine. Fill up with the soaking water. Bring to the boil and add the cream. Let simmer for about 5 minutes.
Roast pine nuts in a pan without fat. Stir starch with 1 tablespoon of water until smooth and thicken the sauce. Add porcini mushrooms and mushrooms. Season with salt and pepper. Drain the noodles and mix with the porcini mushroom sauce and arrange on a plate.
Slice Parmesan cheese over it.