Set the Anova Sous Vide Precision Cooker to 130.0ºF / 54.4ºC.
Pat room temperature steaks dry.
Liberally season both sides of steak with kosher salt and pepper. Place in a medium zipper lock/vacuum seal bag. Allow little to no air to be trapped inside the bag.
Place the bag in the water bath and set the timer for 2 hours.
When the steaks have finished cooking, remove from the water bath and bag. Pat dry.
Heat butter in a cast iron skillet over high heat. When melted and hot, add filets and sear for 30 seconds per side, only flipping once.
Transfer steak to a cutting board and let rest for 4 minutes. Enjoy!
Notes
This is for a medium rare steak. Increase temperature and/or sear for longer if you desire your steak to be more done.