Clean, wash and cut the savoy cabbage into strips. Peel and chop the onions. Wash chicken filets, dab dry and cut into slices. Heat the oil in a large pan and fry the chicken slices until golden brown, turning them over.
Season with salt and pepper and remove. Add butter to the hot frying fat and sauté the onions for about 2 minutes. Add cabbage, braise well and season with salt and pepper. Pour on stock and braise covered for about 15 minutes.
Cook pasta in boiling salted water according to package instructions. Pour the pasta onto a sieve, drain well and add to the cabbage in the pan together with the chicken slices. Mix everything well, heat up again and season with salt and pepper.
Stir the crème fraîche into the pasta pan or add it separately, sprinkle with pepper. Garnish with parsley.