01 - Remove steaks from the refrigerator 30 minutes before cooking to bring to room temperature.
02 - Pat steaks dry with paper towels. Rub both sides with olive oil, salt, and pepper.
03 - Heat a heavy skillet or grill pan over high heat. When hot, add steaks and sear 3–4 minutes per side for medium-rare (adjust for desired doneness).
04 - During the last 1–2 minutes of cooking, add butter to the pan and spoon over steaks.
05 - Transfer steaks to a plate and let rest, covered loosely with foil, for 5 minutes.
06 - Combine all chimichurri ingredients in a bowl and stir well. Let sit for flavors to meld.
07 - Slice steaks against the grain. Serve topped with generous spoonfuls of chimichurri.