Step 1

Let the steak sit out on the counter for 30 minutes until it comes to room temperature.

Step 2

Pat with paper towels then rub a generous amount of the steak spice on both sides.

Step 3

Start your oven broiler with one oven rack at the top, and one oven rack in the middle.

Step 4

Place the oil in the bottom of a cast iron or oven safe skillet and place on the top oven rack and heat up.

Step 5

Once the oil is heated, place the steak into the hot skillet and sear on both sides for 2 minutes, or until browned as you like.

Step 6

Once the steak is browned, reduce the oven heat to 300 °F and place the skillet on the middle oven rack. You can place the thyme sprigs on top and around if desired.

Step 7

Cook for another 7-10 minutes until the steak reaches the desired temperature. Remove and place the porterhouse steak into a cutting board to rest for 5 minutes. The steak will rise another 5 degrees in temperature, so take that into consideration when removing from the oven.