How To Cook Prime Rib Recipe In Roaster Oven? Helpful Guides

Are you looking to impress your guests with a mouth-watering prime rib roast? The perfect prime rib recipe in roaster oven is here. Whether you are cooking for a special occasion or just craving a delicious and juicy cut of meat, this recipe will not disappoint. Cooking prime rib can be intimidating, as it is often considered one of the most luxurious cuts of beef. However, with the right techniques and equipment, such as a roaster oven, achieving tender and flavorful prime rib at home is much easier than you may think. So let’s dive into this simple yet impressive recipe that will surely have everyone coming back for seconds. Your taste buds (and stomach) will thank you later.

Why a Roaster Oven?

Roaster ovens are specially designed to handle large cuts of meat like beef roasts or whole turkeys. The enclosed environment traps in moisture while the heating element safely surrounds the meat to ensure even cooking. Some key advantages of using a roaster oven for prime rib include:

  • Frees up oven space for cooking sides and desserts simultaneously
  • Perfect for novices since it’s far simpler than traditional oven methods
  • Browns and cooks evenly without continuous basting or rotating
  • Infuses incredible flavor when cooking low and slow
  • Retains juices for succulent, fall-apart texture
  • Easy to transport for parties or dinners away from home

If you’ve never cooked prime rib (or any large cut of meat) in a roaster oven before, you’re in for a treat! Time to take the intimidation factor out of holiday feasting.

Why a Roaster Oven?


To feed a crowd with the perfect prime rib from your roaster oven, you’ll need:

  • 1 bone-in prime rib roast (6-7 lbs)
    • For 8-10 servings, plan for around 1 lb per person
    • Have your butcher trim off excess hard fat
  • 1⁄2 cup unsalted butter, softened
  • 6-8 cloves garlic, minced
  • 2-3 Tbsp black pepper
  • 1 Tbsp seasoned salt (or plain salt)
  • 1 tsp onion powder (or garlic powder)

Step-by-Step Instructions

Get ready for effortless prime rib bliss in 6 simple steps:

Prep the Roast

  • Thoroughly pat the roast dry with paper towels and place fat-side up on a rimmed baking sheet.
  • In a small bowl, combine the softened butter, garlic, pepper, seasoned salt, and onion powder. Mix well until fully incorporated.
  • Coat the entire roast liberally with this flavorful butter mixture, gently pressing it into crevices so the seasoning really sticks.
  • For the best results, loosely wrap in plastic wrap and refrigerate uncovered for 24 hours to really amp up the flavor.
  • Let the roast come to room temperature for at least 2 hours before roasting for more even cooking.

Preheat the Roaster Oven

  • Preheat your roaster oven to the highest temperature, typically around 425-450°F.
  • Place the wire rack inside the roaster, no need to add any liquid.

Brown the Exterior

  • Place the seasoned roast fat-side up on the rack. We want lots of direct heat contact to get a deep brown crust.
  • Roast uncovered for 25-30 minutes. Resist the urge to peek.

Cook Low and Slow

  • Lower the temperature to 350°F for the remainder of the cooking time.
  • Roast approximately 10-12 minutes per pound, until it reaches your desired doneness.
    • For a 6 lb roast, estimate 60-75 minutes.
    • For a 7 lb roast, estimate 70-90 minutes.
  • Use an instant-read meat thermometer inserted into the thickest part to check doneness.
    • 120-125°F for rare
    • 130-135°F for medium-rare

Rest and Carve

  • Remove the roast when done and tent loosely with foil. Let rest for 15-30 minutes before carving (a bit longer for bigger roasts).
  • While resting, remove any kitchen strings. Grab the exposed bones and gently pull off the rib rack.
  • Place the roasted meat cut-side down on a cutting board. Starting from the end, slice into 1⁄2-1 inch thick slices against the grain.
  • For presentation, reattach the rib bones to the sliced roast if desired.


  • Arrange the prime rib on a festive platter and serve immediately for maximum tenderness.
  • Enjoy your perfectly roasted prime rib warm with horseradish sauce and your choice of savory sides like garlic mashed potatoes, roasted vegetables, or a fresh salad.
  • For an extra decadent touch, serve slices on top of creamy polenta or soft Yorkshire pudding. The options are endless.

Temperature Guide

Use this temperature guide for reference when roasting prime rib to your ideal level of doneness:

Doneness Internal Temp Description
Rare 120-125°F Bright red center, cool and raw
Medium-Rare 130-135°F Warm red center, soft and juicy
Medium 140-145°F Hot pink center, firmer texture
Medium-Well 150-155°F Slightly pink center, drier meat

For most tender and flavorful results, prime rib is best enjoyed at medium-rare to medium doneness. Aim to pull the roast off 5 degrees before the final temperature listed, since the interior temp will continue rising as it rests.

Bonus Tips

  • For a foolproof doneness test, gently press on the thickest part of the roast. When it’s ready, it should feel slightly springy to the touch.
  • Get creative with seasoning! Consider chili powder, herbs like rosemary or thyme, espresso powder, or dry ranch seasoning in the butter rub.
  • Slice any leftovers very thinly and pile high on sandwiches or salads. Prime rib makes killer French Dip sandwiches when paired with au jus dipping sauce.

Conclusion: How To Cook Prime Rib Recipe In Roaster Oven

This recipe is a guide, so adjust cooking times and seasonings based on your roaster and preferences. You can embrace the convenience and delicious results of prime rib cooked in your roaster oven! Follow the instructions, make it your own, and enjoy mouthwatering roast beef this holiday season.

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