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–+ servings
A beautifully roasted prime rib in a roaster oven, glistening with herbs and juices.

Prime Rib in a Roaster Oven

A simple and straightforward method for cooking a tender and evenly cooked prime rib in a roaster oven.
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Prep Time 15 minutes
Cook Time 3 hours
Resting Time 30 minutes
Total Time 3 hours 45 minutes
Servings: 8 people
Course: Main Course
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

For the Prime Rib
  • 1 rib roast (3-4 pounds) Prime Rib Bone-in or boneless
  • 2 tablespoons Olive Oil
  • 2 teaspoons Salt
  • 1 teaspoon Black Pepper
  • 1 teaspoon Garlic Powder
  • 1 teaspoon Dried Rosemary
  • 1 teaspoon Dried Thyme

Equipment

  • Roaster Oven
  • Roasting pan
  • Meat thermometer

Method
 

  1. Preheat your roaster oven to 450°F (230°C).
  2. Pat the prime rib dry with paper towels. Rub the entire roast with olive oil.
  3. In a small bowl, combine salt, black pepper, garlic powder, rosemary, and thyme. Sprinkle this mixture evenly over the prime rib.
  4. Place the seasoned prime rib, fat side up, in a roasting pan. Insert a meat thermometer into the thickest part of the roast, avoiding the bone.
  5. Place the roasting pan in the preheated roaster oven. Roast for 15 minutes at 450°F (230°C).
  6. Reduce the oven temperature to 325°F (160°C). Continue roasting for approximately 15-20 minutes per pound, or until the internal temperature reaches your desired doneness:
  7. 120-125°F (49-52°C) for rare.
  8. 130-135°F (54-57°C) for medium-rare.
  9. 140-145°F (60-63°C) for medium.
  10. Remove the prime rib from the roaster oven and transfer it to a cutting board. Tent loosely with foil and let it rest for at least 30 minutes before carving.
  11. Carve the prime rib against the grain and serve immediately.

Notes

For a crispier crust, you can broil the prime rib for the last few minutes of cooking, watching it closely to prevent burning.

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