I was surprised to find that most recommendations were to pan sear in a cast iron skillet and then finish off in a 500 degree oven.
I have done it both way...I like this way better.
Go to Calandro's (or Maxwells) and get a Prime Ribeye.
Pat the steak dry with paper towels and add salt and pepper and place in a 275 degree oven for 20-25 minutes (85 degree internal temp for the steak). For Med-Rare.
USE A THERMOMETER
Heat your cast-iron skillet (or stainless steal 18/10 non-stick skillet), add 1 tbsp of veg. oil. And when the oil starts to shimmer and smoke...add the steaks and sear for 2-3 min. per side until it has a nice brown crust.