There's a place nearby that has absolutely massive cowboy steaks:
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They're impossible to grill without overcooking the outside. One could sous vide them, but my favorite method is "reverse sear". I have a really nice, precise "toaster" oven, which is really just a small convection oven. After seasoning and thoroughly drying the steak, I'll put the it on a quarter sheet with a wire rack in the oven at 200f until the internal temperature comes up to 115f which may take up to 2 hours. From there, a quick sear on either side is usually enough to finish it up. The added benefit is that with the drying action of the convection oven, the surface of the steak will develop a nice crust more easily.
Even still a quick read thermometer is necessary to finish.