Adjust oven racks to upper and lower-middle positions. Place a cast-iron or oven-safe skillet in oven and preheat oven to 375 degrees.
Meanwhile, pat steaks dry thoroughly with a paper towel. Season on all sides generously with salt and freshly ground black pepper.
Carefully remove skillet from oven and place over medium-high heat. Add butter, garlic, thyme, and rosemary, swirling to combine the spices as the butter melts.
Add steaks, and sear until a good crust forms, about 3 to 4 minutes, basting with butter occasionally.
Flip steaks and sear other side, about 3 to 4 minutes more. Using tongs, sear all sides of the steak, about 30 seconds.
Place steaks in skillet in oven, and cook until desired temperature is reached, 3 to 5 minutes for medium-rare (an internal temperature of 130 to 135 degrees), 5 to 7 minutes for medium (140 to 145 degrees) or 8 to 10 minutes for medium-well (150 degrees).
Remove steaks from skillet and rest 5 minutes before serving.
