One way to cook steak that is easy
1. Heat oven to 500
2.Get a cast iron skillet really hot, put the steak in 2 minutes on each side, no oil - salt and peppereach side.
3. Turn oven down to 450, add butter to steak, put in oven for 4 minutes
4. Take out of oven, take out of pan and place on cutting board with foil to rest about 5 minutes.
On a 1 inch flat iron steak this yields a seared outside, a ring of brown, and a warm pink center about 99% of the time. Perfection.