Prep Steak: Let steak sit out for 30-60 minutes to let them come to room temperature. Season with kosher salt and ground black pepper.
Sear: Bring a large (12 inch) cast iron skillet to medium high heat. Add 1 tablespoon butter and let melt. Sear steak on each side for 2 minutes and 1 minute on any fat that maybe on the edges. Note: you may need to turn on your cooktop fan for this part.
Finish Cooking: Reduce to medium/medium-low heat, add 1 tablespoon butter, and fresh thyme. Spoon melted butter over steak and flip steak every 1-2 minutes until steak reaches an internal temperature of 127 degrees F. (for a medium-rare finish). (Steak will continue to cook as it rests in Step 4 and the internal temp will end up between 130-135 which is medium-rare). Use an internal meat thermometer to track the internal temperature.
Rest: Remove from skillet and transfer to a plate. Let steak rest 10 minutes before serving.
Notes
Cook Time: ultimate cook time will depend upon how thick your steaks are - we tested this recipe with 1 inch thick steaks and the total cook time was approx. 8 minutes. Use an digital probe thermometer to accurately track the temp, so you know when the steak is done.