Preheat your oven to 325°F (163°C).
Rub the roast beef generously with your seasoning mix, making sure you cover all of the sides evenly.
Heat a heavy oven-safe skillet or roasting pan over medium-high heat. Add a bit of oil with a high smoking point.
Sear the roast on all sides until it develops a rich brown crust, about 2-3 minutes per side, regardless of how thick the cut is.
Transfer the roast to the preheated oven and roast until your desired level of doneness (use an easy-read meat thermometer to check). For medium-rare, it's about 135°F (57°C) internal temperature.
Baste the roast with olive oil or melted butter occasionally during cooking to keep it moist.
Once the meat is cooked, remove it from the oven and tent with aluminum foil to keep the moisture inside the meat. Allow it to rest for at least 15 minutes before slicing and plating.