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Slow Cooker Prime Rib Roast Recipe with Garlic Herb Butter

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This slow cooker prime rib roast is melt-in-your-mouth tender and infused with rich garlic herb butter. It’s an easy, foolproof centerpiece for holidays or cozy family dinners, with minimal prep and maximum flavor.

Ingredients

Scale
  • 4–5 lbs prime rib roast (bone-in or boneless)
  • 2 tbsp kosher salt
  • 2 tsp freshly cracked black pepper
  • 2 tbsp olive oil
  • 1/2 cup unsalted butter, softened
  • 5–6 garlic cloves, minced
  • 2 tbsp fresh rosemary, finely chopped (or 2 tsp dried)
  • 1 tbsp fresh thyme leaves (or 1 tsp dried)
  • 2 tbsp fresh parsley, chopped
  • 1 tsp lemon zest (optional)
  • 1 cup beef broth
  • 2 tbsp Worcestershire sauce
  • 1 medium yellow onion, sliced

Instructions

  1. Remove the prime rib from the fridge at least 1 hour before cooking and pat dry with paper towels.
  2. Rub olive oil over the entire roast. Combine kosher salt and black pepper, then sprinkle all over, pressing gently so it adheres.
  3. In a small bowl, mash together softened butter, minced garlic, rosemary, thyme, parsley, and lemon zest until smooth.
  4. Spread half the garlic herb butter over the top and sides of the roast. Reserve the rest for later.
  5. Arrange sliced onions in the bottom of your slow cooker. Place the seasoned roast on top. Pour beef broth and Worcestershire sauce around the sides.
  6. Cover and cook on low for 5–6 hours for medium-rare (internal temp 130°F), or 6–7 hours for medium (135–140°F). Check at the 5-hour mark with a meat thermometer.
  7. Carefully lift the roast out and tent with foil for 20–30 minutes to rest.
  8. Mix the reserved garlic herb butter with a tablespoon of hot drippings to make a finishing sauce.
  9. Slice the roast as desired, drizzle with garlic herb butter sauce, and sprinkle with extra herbs if desired. Serve immediately.

Notes

For best results, use a meat thermometer to check doneness. Resting the roast is essential for juicy slices. Prep the garlic herb butter up to 2 days ahead for convenience. For a crispy crust, broil slices for 2–3 minutes after slow cooking. Recipe is naturally gluten-free and can be made dairy-free with plant-based butter.

Nutrition

Keywords: prime rib, slow cooker, garlic herb butter, holiday roast, beef, easy dinner, gluten-free, keto, tender roast, crockpot

Find it online: https://avabake.com/slow-cooker-prime-rib-roast-recipe-with-garlic-herb-butter-easy-and-tender/