Season steak on both sides with salt. Keep at room temperature for 45 minutes. Preheat the oven to 225 degrees. Spray a rimmed baking sheet with cooking spray.
Add black pepper to both sides of the steak. Transfer to the middle oven rack. Cook for 30-45 minutes, using a meat thermometer to check the temperature. Preheat a cast-iron skillet with a drizzle of oil over medium-high heat. Sear for 2-3 minutes on each side.
Move steaks to a clean plate tented with foil to rest for 5 minutes.