Prime Rib Soup is the easiest way to turn leftover holiday rib roast into a creamy, cozy bowl of comfort — no extra effort required. It’s quick, family-friendly, and perfect for those “house is full, energy is low, dinner still needs to happen” days. Tender beef, savory mushrooms, silky broth… it’s a low-lift, high-reward meal that feels special without you actually doing much.
Grab a piece of crusty bread for dipping and let's get started!
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Prime rib is my absolute favorite — tender, rich, and always worth the splurge. And the dream doesn’t stop after dinner, because those leftovers turn into Prime Rib Soup: a silky, savory, no-effort bowl loaded with tender beef and mushrooms. It’s cozy, comforting, and perfect for holiday leftovers, house-full weeks, or any night you want something delicious without lifting a finger.
Let me show you why this one’s a keeper.
- It turns leftovers into luxury. Stretch that pricey prime rib into another unforgettable meal — nothing wasted, everything delicious.
- Low effort, high reward. A handful of simple steps deliver a soup that tastes like a restaurant bowl without the restaurant effort.
- Ultra-creamy + cozy. The broth gets silky and rich thanks to mushrooms, sour cream, and a quick simmer that makes everything feel slow-cooked.
- Endlessly customizable. Add veggies, stir in pasta, swap the protein — this soup plays well with whatever you’ve got in the fridge.
- Perfect for company. Family in town? Friends dropping by? This feeds a crowd without stressing you out.
- Cold-weather comfort. It’s the kind of hearty, warm, spoon-hugging bowl that makes chilly nights feel instantly better.
What You'll Need and Why
- Leftover Prime Rib – The whole reason to make prime rib in the first place. But good news: this recipe works beautifully with any leftover roast or steak you’ve got hanging around — rib roast, sirloin, strip, tenderloin. If it’s cooked beef, you’re golden.
- Butter, Yellow Onion, Garlic, Cremini Mushrooms – The holy trinity of cozy flavor. Sautéed in butter, these create the savory backbone of the entire soup. There is simply no better combination.
- Beef Broth + Beef Broth Base – Adds depth and that rich, beefy warmth. Use a good-quality broth and base — this soup is simple, so you’ll taste the difference.
- Dried Thyme, Dijon Mustard, Worcestershire Sauce – The umami crew. These three create a savory, well-rounded flavor base without overpowering the prime rib.
- Kosher Salt + Fresh Ground Pepper – The classics. Season as you go, taste often, and be generous with the pepper.
- Sour Cream – For that creamy, tangy swirl that makes the broth silky and luxurious. Add extra on top when serving.
- Fresh Parsley or Chives – A pop of color and freshness to balance the richness.
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Swaps and Flavor-Boosting Variations
- Add Any Veggies You Love – This soup is beefy, cozy, and incredibly forgiving. Carrots, celery, peas, green beans, spinach, kale, zucchini — if it’s in your fridge and you love it, toss it in. It all plays beautifully with the savory broth.
- Make It a Pasta Soup – Add a small pasta like ditalini, orzo, elbows, or mini shells when you add the mushrooms. Cook until just al dente, then stir in the diced prime rib. It turns the soup into a hearty, almost-stew situation in the BEST way.
- Go the Potato Route – Diced potatoes (Yukon Golds are king here) can be added with the mushrooms and simmered until tender. You’ll end up with a cozy, almost chowder-like bowl that feels like winter comfort at its finest.
- Swap the Protein – No leftover prime rib? No problem. This recipe works beautifully with leftover roast beef, steak, tri-tip, or even pot roast. The broth flavor is strong enough to make almost any cooked beef shine.
- Boost the Creaminess – Add a splash of heavy cream, half-and-half, or even a spoonful of mascarpone or cream cheese for a richer, silkier texture.
- Cheese, Please – A generous sprinkle of freshly grated Parmesan, Pecorino Romano, or even a little Gruyère on top sends this soup into “restaurant-level” territory with zero added effort.
- Vegetable-Forward Version – Want it lighter? Skip the sour cream and stir in a handful of fresh spinach or kale at the very end. Still cozy, still hearty, just a touch brighter.
Little Tips and Tricks, Big Cozy Bowls
- Cut everything into spoon-sized pieces. Small, evenly sized onions, mushrooms, and prime rib make the soup feel luxurious and balanced — every bite hits just right.
- Thicken it if you want. Prefer a heartier, stew-like finish? Stir in a quick cornstarch slurry (1–2 teaspoons cornstarch mixed with cold water) when you add the prime rib.
- Customize the creaminess. Not a sour cream fan or don’t have any? A splash of heavy cream, half-and-half, or even a spoon of cream cheese will make the broth silky. Want to keep it simple? Go fully brothy — it’s delicious either way.
- A note on beef broth. Every broth has different salt levels, so taste as you go and adjust with salt, pepper, or a little beef broth base. This soup is simple, so a good-quality broth really shines.
- Add the prime rib at the end. Since it’s already cooked, stir it in during the last few minutes to keep it tender instead of overdone.
- Don’t skip the garnish. Fresh parsley or chives brighten the whole bowl and balance the richness.
Prime Rib Soup Recipe
Equipment
Ingredients
- 1½ lbs leftover prime rib, cute into small bite-sized pieces
- 2 tablespoon butter
- 1 med onion, diced
- 5-6 cloves garlic, minced
- 1 teaspoon dried thyme leaves
- 16 oz cremini mushrooms, thinly sliced
- 8 cups beef broth
- 1 tablespoon beef broth base
- 1 tablespoon Worcestershire sauce
- 1 tablespoon dijon mustard
- 1 cup sour cream
- kosher salt and fresh ground pepper, to taste
- fresh parsley and chives, for garnish
Instructions
- In a large dutch oven on medium heat, sauté diced onions in the butter until they become translucent. Add the garlic and dried thyme leaves, cooking just until they become fragrant.
- Add the beef broth to the dutch oven along with the beef broth base, Worcestershire sauce, and dijon mustard. Bring the broth mixture to a simmer. Taste for salt at this point, adding some along with fresh ground pepper if desired.
- Add the sliced mushrooms to the simmering broth and cook until the mushrooms are softened.
- In a separate mixing bowl, whisk the sour cream along with some of the beef broth. This will help loosen the sour cream so that it mixes easier into the soup.
- Pour the sour cream mixture into the soup, stirring until it's combined. Again, taste the broth. Make sure your salt level is good. If you need more, add more.
- Add in the prime rib pieces, cooking until they're just warmed through.
- Garnish with a dollop of sour cream, fresh herbs, and fresh cracked pepper. We always have to serve with a side of crusty bread for dunking. Enjoy!
Nutrition
Make It A Meal
- Crusty Bread or Dinner Rolls. This soup was born for dipping. Serve with a warm baguette, sourdough, or soft dinner rolls so no silky broth goes to waste.
- Simple Green Salad. Balance the richness with something bright — think lemony arugula, chopped romaine, or any quick salad situation you love.
- Baked Potatoes or Twice-Baked Potatoes. A comforting, hearty pairing that feels like the perfect winter meal.
- Steamed or Roasted Veggies. Broccoli, green beans, asparagus, Brussels sprouts — anything that adds a little color and crunch to the bowl.
- A Sprinkle of Fresh Herbs + Cheese. Parsley, chives, or thyme with a shower of Parmesan or Gruyère makes each bowl feel fancy without the effort.
- A Cozy Night-In Vibe. Honestly? This soup shines all by itself. Add a blanket, a movie, and call it dinner.
Storage and Reheating Instructions
Store:
Keep leftovers in an airtight container in the fridge for up to 3 days.
Reheat:
Warm gently on the stovetop or in the microwave (cover with a damp paper towel).
The secret to reheating creamy soups? Go slow. Low and gentle heat keeps the broth silky instead of separating.
Freeze:
Freeze in airtight containers for up to 3 months.
Thaw overnight in the fridge, then reheat slowly on the stovetop. Creamy soups stay smooth when both the thaw and the reheat are gradual.
More Cozy Bowls To Love
- Creamy White Lasagna Soup – Creamy, cozy, and loaded with parmesan goodness. If you love comforting bowls, this one’s a must.
- Loaded Baked Potato Soup – Bacon, potatoes, cheese… the trifecta. A winter staple that always gets rave reviews.
- Vegetable Beef Soup – Another hearty, beefy classic that’s perfect for leftover nights and chilly weather.
- Dutch Oven No Knead Bread – The easiest way to get a warm, crusty loaf on the table. And yes, it’s perfect for dipping.
- Quick and Easy Pastina (aka Italian Penicillin) – A silky, soothing comfort bowl with serious healing powers. My readers are obsessed with this one.
You Asked, I Answered
Is this Prime Rib Soup recipe gluten-free?
Yes! The entire recipe is naturally gluten-free as written. Just double-check your beef broth and beef base to make sure they’re certified gluten-free, since brands can vary.
Do I have to use prime rib?
Nope! The beauty of this soup is how flexible the base is. You can use any leftover cooked beef — pot roast, tri-tip, grilled ribeye, sirloin, or even cooked ground beef. It’s also fantastic with rotisserie chicken if that’s what you have on hand. And if you want to keep it veggie-centric, just skip the protein entirely for a phenomenal creamy mushroom soup.
Can I make this soup thicker?
Absolutely. Stir in a quick cornstarch slurry (1–2 teaspoons cornstarch mixed with cold water) toward the end of cooking for a heartier, stew-like consistency.
Does Prime Rib Soup freeze well?
Yes — just follow creamy-soup rules. Freeze up to 3 months, thaw overnight in the fridge, and reheat slowly to keep the broth smooth.
Can I skip the sour cream?
For sure. Use heavy cream, half-and-half, Greek yogurt, or cream cheese for richness, or keep it simple and brothy. It’s delicious all ways.
What veggies can I add?
Pretty much anything: carrots, peas, green beans, spinach, kale, celery, zucchini — this soup plays well with whatever’s in your fridge.
Who's Stirring the Pot?
Hi, I’m Ruth—recipe developer, comfort-food creator, and the voice behind Rufus For Real. I specialize in cozy, doable, flavor-packed meals for real-life kitchens, and I’m a firm believer that breakfast, dinner, and everything in between should be simple, satisfying, and impossible to mess up.
You’ll find me sharing even more comfort-food goodness, kitchen tips, and behind-the-scenes chaos over on Instagram, Pinterest, Facebook, TikTok, and YouTube (@rufusforreal everywhere).
If you love approachable recipes with a whole lot of personality, pull up a chair—there’s always room at this table.
Happy Cooking!
-Ruth aka Rufus
DeniseSC says
Made last night, wonderful!! I thought there would be too many mushrooms, not! They give it the creaminess. I thought that would be too much garlic. Nope, garlic didn’t stand out at all. Took longer to prepare, it usually does the first time I make something. But there is a lot of time on washing and slice/chop ingredients. If you did that prep stuff earlier and are just assembling that 10 minutes would be accurate. I used 2 tablespoons of unsalted butter; the directions said to sauté onions in it. But it wasn’t listed as an ingredient on the recipe. When I make it again I will try it with only 1TBSP. Portions were right on. Crusty bread would be better than crackers. Didn’t have salad ingredients, so I roasted broccoli. The sour cream dollop was great and I used chopped basil that I had for the herb. Would be 5* except for missing ingredient on list and amount of prep time. Thanks Rufus!!!
Rufus says
I'm so glad you liked it!
Amelia says
This is so good! We didn’t have prime rib, but used leftover steak and it was great!
April says
Delicious! I did not add any cream, just a little tiny bit of evaporated milk in the bowl while serving. Verrrrrrrrrry tasty recipe. Thank you!
Rufus says
I am so very happy to hear that you loved it! Have a wonderful day and thanks so much for letting me know!