On the stove over medium high heat, heat the skillet and oil until hot.
While the skillet is heating season the steak with salt and pepper. Once the pan and oil are hot add the steak. It should start sizzling immediately. Cook undisturbed for 5 minutes.
After 5 minutes add the garlic cloves and butter and flip the steak. Spoon the melted butter and oil over the top of the steak. Cook for another 5 minutes. With a 1 inch steak 5 minutes per side should get to medium-rare. Cook until the steak is 5°F / 3°C lower than desired temperature. Remove from heat.
Allow to rest for 5 minutes or half of the cooking time. Slice and top with chimichurri sauce.