01 - Remove beef tenderloin steaks from the refrigerator 30 minutes before cooking to reach room temperature. Pat steaks thoroughly dry with paper towels and season both sides generously with kosher salt and freshly ground black pepper.
02 - Heat olive oil in a large skillet over medium-high heat until the oil shimmers and begins to smoke slightly.
03 - Place steaks carefully in the hot skillet. Sear for 3-4 minutes per side for medium-rare doneness. Adjust cooking time according to preferred doneness. Transfer seared steaks to a clean plate, tent loosely with aluminum foil, and allow to rest.
04 - Reduce heat to medium in the same skillet. Add butter and minced shallots, sautéing for 2 minutes until softened and translucent.
05 - Add minced garlic and drained green peppercorns to the skillet. Cook for 1 minute, stirring constantly to prevent garlic from burning.
06 - Remove skillet from heat and carefully add brandy to prevent flare-ups. Return to medium heat and simmer, scraping up browned bits from the bottom with a wooden spoon, until liquid is reduced by half, approximately 2 minutes.
07 - Pour in heavy cream and add Dijon mustard and Worcestershire sauce. Simmer gently for 3-5 minutes, stirring occasionally, until sauce thickens enough to coat the back of a spoon. Season with salt to taste.
08 - Return rested steaks to the skillet, spooning the warm cream sauce over the meat. Warm through for 1 minute. Serve immediately on warmed plates with additional sauce spooned over each steak. Garnish with extra peppercorns if desired.