In a large cast iron skillet or other heavy-duty skillet, heat olive oil over medium-high heat.
In a small bowl, combine rosemary, garlic powder, salt, and pepper. Rub each side of the steak with the mixture and place the steak in a hot skillet.
Sear on both sides for about 2 minutes per side.
Reduce heat to medium. For medium-rare steaks (internal temperature of 145° – 160°F), cook for an additional 6-8 minutes, turning once to ensure even cooking on both sides. For well-done steaks, cook for an additional 2-3 minutes.
Remove steaks from skillet, cover, and allow them to rest for 5-10 minutes before serving. For a more tender result, cut steaks in thin slices against the grain.
Notes
Note: If your steaks are thin, reduce cook time by 3-5 minutes.