Clean the Brussels sprouts, cut in half depending on size, wash, put in boiling salted water, bring to the boil and cook for about 12 minutes. Pour into a sieve and drain well. Peel and finely chop the onion. Wash the thyme, shake dry and pluck the leaves from the stalks.
Cook the pasta in boiling salted water according to the instructions on the packet. Drain, quench briefly, drain. In the meantime heat oil and butter in a large pan, add Brussels sprouts and fry briefly.
Add the onion and about half of the thyme, fry briefly. Dust with flour and sauté briefly.
Deglaze with stock and cream while stirring. Bring to the boil, crumble gorgonzola and stir in. Bring to the boil, season with salt and pepper. Let simmer for about 2 minutes. In the meantime chop nuts coarsely.
Stir the noodles into the sauce. Heat briefly. Arrange on plates, sprinkle with nuts and remaining thyme.