Cook the pasta in boiling salted water for ten to twelve minutes. Wash the chicken fillets, dab dry and rub with salt and pepper. Heat the remaining oil in a pan and fry the fillets in it for ten minutes until golden brown.
Clean, wash and slice the mushrooms. Peel and finely chop the onion. Heat the fat in a pot and fry the onion until transparent. Add the mushrooms and fry. Deglaze with cream.
Put a few leaves of sage aside, cut the rest into fine strips and add to the cream. Let it boil down a little. Season to taste with salt and pepper. Whisk the egg yolks and add to the no longer boiling sauce.
Drain the pasta and turn in the sauce. Cut the chicken fillets open and arrange on plates with the noodles. Garnish with the sage set aside.