How to Make It
Sprinkle steaks on both sides with salt and pepper. Chill, uncovered, at least 1 hour, up to 8 hours.
Remove steaks from refrigerator, and let stand at room temperature 30 minutes.
Preheat oven to 450°F. Heat oil in 12-inch cast-iron skillet over medium-high. Carefully place steaks in hot oil, and sear 3 minutes on each side. Place skillet in preheated oven, and cook until desired degree of doneness, about 5 minutes for medium-rare.
Remove from oven; tilt skillet towards you so drippings collect in bottom of skillet. Add butter, thyme, and garlic to drippings, and spoon mixture over steaks for 2 minutes.
Place steaks on a wire rack set in a rimmed baking sheet, and let rest 5 minutes. Thinly slice steaks against the grain, and serve with a sprinkle of sea salt.