Heat the oil and butter in a large heavy bottomed pan on medium high heat.
Lightly salt steak and place it in the pan. Sear for 2minutes, flip, sear for another 2 minutes, flip, sear 1 more minute then remove from the heat and rest.
Deglaze the pan with the wine, 1 minute.
Add the chicken stock, cream, and peppercorns and cook for 1 minute.
Add the steak juices and mushrooms with a pinch of salt.
Simmer on medium for 8 minutes while the pasta is cooking.
Add the pasta and reserve pasta water and cook for another three minutes until the sauce thickens.
Serve with the steak sliced on top.