Prep the Steaks (5 minutes)
Remove filet mignon steaks from the fridge 30 minutes before cooking.
Pat dry with paper towels. Season generously with salt and pepper on all sides.
Preheat & Sear (5–7 minutes)
Preheat your oven to 400°F (200°C).
Heat a cast iron skillet over medium-high heat. Add olive oil.
When the oil is shimmering and just about to smoke, carefully add the steaks.
Sear without moving for 2–3 minutes until a golden crust forms. Flip and sear another 2–3 minutes.
Baste with Butter & Herbs (2–3 minutes)
Reduce heat to medium. Add butter, smashed garlic cloves, and rosemary sprigs.
Tilt the skillet and use a spoon to baste the steaks with the melted butter for extra richness and flavor.
Finish in the Oven (4–8 minutes)
Transfer the skillet to your preheated oven.
Cook until steaks reach desired internal temperature:
Rare: 120–125°F
Medium Rare: 130–135°F
Medium: 140–145°F
Use a meat thermometer for best accuracy.
Rest & Serve (5–10 minutes)
Remove filet mignon from the oven. Transfer to a plate.
Tent loosely with foil and let rest 5–10 minutes — this seals in the juices.
Slice and serve with pan juices drizzled on top.