Prime Rib Roast (The Best)

Ingredients

• • 1 tbsp unbleached all-purpose flour
  • 1 tsp salt
  • 1 tsp ground black pepper
  • 1 tsp onion powder
  • 1/2 tsp garlic powder
  • 1 roast beef prime rib, about 4.5 lbs (2 kg) with the bone, at room temperature for 1 hour