Prepare the white pasta sauce and keep it warm while you cook the pasta in salted water until al dente.
Place the sliced Brussels sprouts on a sheet pan and toss with the oil, salt, and ground black pepper. Bake in a preheated 350 degree oven for 30-40 minutes or until brown spots appear and they are tender enough to your liking.
When the pasta is cooked, drain and add to the white sauce along with the nutritional yeast. Mix well and check if you need more salt and pepper. It will look like there's a lot of sauce, but don't worry, the pasta will absorb it.
Cover the pot, make sure the heat is off, and let the pasta stand in the sauce for about 10 minutes.
Open, stir once, and serve with the Brussels sprouts scattered over the pasta.