01 - Remove the prime rib from the refrigerator at least 1 hour before cooking to reach room temperature.
02 - Set oven temperature to 450°F.
03 - Combine minced garlic, chopped rosemary, chopped thyme, olive oil, and Dijon mustard in a small bowl; mix to form a paste.
04 - Pat prime rib dry with paper towels, then season all sides generously with kosher salt and freshly ground black pepper.
05 - Rub the herb garlic paste evenly over the entire surface of the roast.
06 - Place the roast bone-side down on a roasting pan rack.
07 - Roast in the preheated oven at 450°F for 20 minutes to develop a crust.
08 - Lower oven temperature to 325°F and roast for an additional 1 hour 40 minutes, or until internal temperature reaches 125°F for medium-rare.
09 - Remove roast from oven, tent loosely with foil, and let rest for at least 20 minutes before slicing.