01 - Remove steaks from the refrigerator 30 minutes before cooking to bring to room temperature. Pat dry thoroughly and season both sides generously with salt and black pepper.
02 - Heat olive oil in a heavy skillet over medium-high heat. When hot, add steaks and sear for 3-4 minutes per side for medium-rare, adjusting time for desired doneness. Transfer to plate, tent with foil, and let rest.
03 - Reduce heat to medium. Add butter to the same skillet and sauté minced shallot for 1-2 minutes until softened and fragrant.
04 - Stir in crushed green peppercorns. Carefully add brandy or cognac and let bubble for 30 seconds, scraping up browned bits from pan bottom.
05 - Pour in beef stock and simmer for 2 minutes until slightly reduced.
06 - Lower heat and stir in heavy cream. Simmer until sauce thickens slightly, about 2-3 minutes. Season with salt to taste.
07 - Return steaks to pan for 1 minute, spooning sauce over top to reheat. Serve immediately with generous spoonfuls of peppercorn sauce.