01 - Remove steaks from the refrigerator 30 minutes before cooking to bring to room temperature for even cooking.
02 - Pat steaks completely dry with paper towels. Rub both sides thoroughly with olive oil, then season evenly with salt and black pepper.
03 - Heat a heavy skillet or grill pan over high heat until smoking hot. Add steaks and sear for 3-4 minutes per side for medium-rare doneness. Adjust timing slightly for your preferred level of doneness.
04 - During the final 1-2 minutes of cooking, add butter to the pan. Tilt the pan and spoon the melted butter continuously over the steaks for extra flavor and richness.
05 - Transfer steaks to a clean plate and let rest, covered loosely with aluminum foil, for 5 minutes. This allows juices to redistribute throughout the meat.
06 - While steaks rest, combine parsley, oregano, garlic, olive oil, red wine vinegar, red pepper flakes, salt, and pepper in a mixing bowl. Stir thoroughly to combine and let sit for flavors to meld.
07 - Slice steaks against the grain into thin strips. Arrange on plates and top with generous spoonfuls of chimichurri sauce.