Preparation:

In a non-stick frying pan, add a little oil and fry the finely chopped onion. Then add the cleaned and chopped fresh mushrooms.
Simmer until tender, then add the tomato sauce, beans, thyme and a pinch of salt.
Let it cook on low heat for about twenty minutes.
Boil the pasta in very salted water, drain after a few minutes and toss into the pan with the sauce. Serve by adding extra virgin olive oil and a sprinkle of black pepper.