To make in the oven, bake the potatoes at 350 degrees F until cooked through and tender, 25 to 30 minutes. Bake the steaks on a rimmed baking sheet at 250 degrees F until the internal temperature reaches 110 to 120 degrees, or rare, 30 to 35 minutes. Heat a cast-iron pan over high heat. Sear the steaks on each side until a golden brown crust forms, 3 to 4 minutes per side.