In a small bowl, combine kosher salt, black pepper, garlic powder, onion powder, smoked paprika, dried rosemary, dried thyme, and mustard powder. Mix well.
Pat the prime rib dry with paper towels to remove excess moisture.
Generously rub the dry mixture all over the prime rib, ensuring an even coating on all sides.
Cover the seasoned prime rib with plastic wrap and refrigerate for at least 2 hours or overnight to allow the flavors to penetrate.
Preheat your oven to your preferred temperature and place the prime rib on a roasting rack in a shallow pan. Cook until it reaches your desired doneness.
Let the cooked prime rib rest for 15 to 20 minutes before slicing to retain its juices.
Notes
This prime rib dry rub enhances the flavor of your roast with a bold blend of spices and herbs. Adjust the seasoning to your taste and enjoy a restaurant quality meal at home.