Take filet steaks and allow these to come up to room temperature (around 30 minutes). Use a paper towel to blot and dry any moisture that is on the steak. Season steaks generously with salt and pepper (seriously, don't be shy!). Set steaks aside.
Preheat a stainless steel pan until hot. Once hot, add 1 tbsp of cooking oil. The oil should begin to lightly smoke. This means the pan is hot enough. Carefully add both seasoned filets in the pan. Searing 3-4 minutes on each side.
Once steaks have seared, add butter, crushed garlic, and rosemary to the pan. Once butter has melted, carefully tilt the pan and use a spoon to scoop up the rosemary garlic butter sauce and drizzle this on top of the cooking steak. Continue to baste the steak until the desired temperature is reached. Lower the heat, and transfer steaks from the pan to a cutting board. Allow steaks to rest.