Remove the fillet steaks from the refrigerator 30-60 minutes before cooking.
This allows them to reach room temperature, ensuring even cooking.
Preheat your oven to 360°F.
At the same time, heat a medium cast iron skillet over high heat.
Add olive oil to the skillet.
Season the steaks generously with salt and black pepper.
Place them in the hot skillet.
Sear each side for 2-3 minutes until a golden-brown crust forms.
Add butter, thyme, rosemary, and smashed garlic to the skillet.
Spoon the melted butter over the steaks as they cook for added flavor.
Transfer the skillet to the preheated oven.
Cook the steaks for 5-6 minutes for medium-rare or longer for your desired doneness.