Prime Rib with Mashed Potatoes

This Prime Rib with Mashed Potatoes is the kind of classic comfort-food dinner that makes a beautiful centerpiece for a special meal. The beef is tender and juicy with a rich, savory flavor, while creamy mashed potatoes and homemade pan gravy complete the plate.

Ingredients

For the Prime Rib

• 4–5 lb boneless or bone-in prime rib roast
• 2 tablespoons olive oil
• 4 cloves garlic, minced
• 2 teaspoons kosher salt
• 1 teaspoon black pepper
• 1 teaspoon dried rosemary
• 1 teaspoon dried thyme

For the Mashed Potatoes

• 2 lbs potatoes, peeled and cubed
• 4 tablespoons butter
• ½ cup warm milk
• ½ teaspoon salt
• ¼ teaspoon black pepper

For the Gravy

• 2 cups beef broth
• 2 tablespoons butter
• 2 tablespoons all-purpose flour
• Pan drippings from the roast

Instructions

Prepare the Prime Rib

1. Remove the roast from the refrigerator about 1 hour before cooking.
2. Preheat the oven to 450°F (230°C).
3. Pat the roast dry with paper towels.
4. Rub the roast with olive oil, then season generously with garlic, salt, pepper, rosemary, and thyme.
5. Place the roast in a roasting pan, fat side up.
6. Roast at 450°F for 15 minutes.
7. Reduce the oven temperature to 325°F (165°C) and continue roasting until the desired internal temperature is reached.
8. Remove the roast from the oven and loosely cover it with foil.
9. Let it rest for 20–30 minutes before slicing.

Make the Mashed Potatoes

1. Place the potatoes in a large pot and cover with salted water.
2. Bring to a boil and cook for 15–20 minutes, until fork-tender.
3. Drain thoroughly.
4. Add butter and warm milk.
5. Mash until creamy, then season with salt and pepper.

Make the Gravy

1. Pour the pan drippings into a saucepan, leaving any excess fat behind if desired.
2. Add butter and heat over medium heat.
3. Whisk in the flour and cook for about 1–2 minutes.
4. Gradually whisk in the beef broth.
5. Continue cooking until the gravy thickens.
6. Season with salt and pepper to taste.

Serve

Slice the rested prime rib into thick portions and serve alongside creamy mashed potatoes. Spoon the warm gravy over the beef and potatoes for a rich and satisfying finish.

Tips

Use a meat thermometer to check the roast rather than relying only on cooking time. The internal temperature will continue to rise slightly while the roast rests.

Allowing the prime rib to rest before slicing helps retain its juices and makes it easier to cut cleanly.

Conclusion

Whether you’re preparing a holiday dinner or simply craving an impressive comfort-food meal, Prime Rib with Mashed Potatoes is a timeless combination. Tender roast beef, creamy potatoes, and rich gravy make every bite satisfying.