Take prime rib out of the fridge 1-2 hours before cooking so it can come to room temperature and cook more evenly.
Pat the prime rib with a paper towel to get all the moisture.
In a bowl, mix the softened butter with the herbs, salt, pepper, and garlic.
Put the prime rib in a roasting pan then coat the top of the prime rib with the butter mixture.
Stick a oven proof thermometer in the roast (if you have one).
Preheat oven to 500 degrees F. Cook for 15 minutes then turn down the heat to 325 degrees F.
To achieve your desired level of doneness, follow these guidelines: Rare: 10-12 minutes per pound, or until the thermometer hits 120°F. Medium Rare: 13-14 minutes per pound, or until the thermometer reaches 130°F. Medium: 14-15 minutes per pound, or until the thermometer hits 140°F. Medium Well: 150°F - just keep an eye on it to avoid overcooking!
Let the roast rest for 20 minutes then cut!
Notes
The roast will rise 5-10 degrees more as it rests so you should take it out earlier so it won't be overdone. Using a thermometer makes life easier!