Preheat oven to 375 degrees F.
Turn heat on medium high heat and get cast iron pan very hot, prior to adding oil.
Add oil and wait about 1 minute. Add steaks. Steaks must be dry and cold.
Use a grill press if you have one. The press keeps the steak on the pan evenly.
Sear for about 3 minutes. The steak should easily move. If not give it another minute.
Test with an instant read thermometer which will help gage how much time you need in oven. You will want the final temperature to be 130 degrees F.
Once seared, turn over and place in oven. Cook to 130 degrees F. for medium rare.
Season with salt and pepper. Allow to rest for 7 minutes, before cutting.