London Broil Pot Roast (Easy Slow Cooker Recipe!)

Name: London Broil Pot Roast (Easy Slow Cooker Recipe!)
Prep time: 15 min
Cook time: 495 min
Total time: 510 min
Ingredients: 2½-3 lbs London Broil roast; salt and pepper; 2 tbsp olive oil; 1 onion (sliced); 4-5 garlic cloves (minced); 1 packet beefy onion soup mix; 1 cup beef broth; 2 tbsp Worcestershire sauce; 1½ lb small Yukon gold potatoes; 3 large carrots (cut into 3-inch pieces); 1 bay leaf; 4 sprigs fresh thyme; 1 cup water; 1 tbsp cornstarch; 2 tbsp cold water

Published on November 30, 2023 by Sarah Troester

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Published on November 30, 2023 · Updated on October 24, 2026 by Sarah Troester

This post may contain affiliate links. Please read our disclosure policy.

Yes, you can make London broil in a crock pot, and it turns into a tender, sliceable pot roast. Sear a 2½–3 lb London broil, then slow cook it with a packet of beefy onion soup mix, beef broth, Worcestershire, garlic, onion, baby Yukon gold potatoes, carrots, thyme and a bay leaf on LOW for 8–10 hours or HIGH for 4–5 hours. A quick cornstarch slurry turns the broth into gravy, and the recipe serves 6.

The best and easiest pot roast with tender London broil, potatoes, carrots, and a flavorful broth. It’s cooked low and slow and simmered until perfection in the slow cooker.

Slow cooker London broil pot roast with tender beef, carrots, baby potatoes and onion gravy in a white bowl

My slow cooker has become my new best friend during these cold winter months. It’s perfect for busy days when I know I won’t have a lot of time to spend in the kitchen.

Is there anything more comforting than coming home to a house full of the aroma of a delicious pot roast? This recipe for London broil made in the crockpot is a dream to come home to. It’s so easy to whip up and a true classic when it comes to comfort.

Made with tender London broil roast and three types of veggies, this recipe comes simply and perfectly together with the help of a soup mix packet for a hearty and comforting broth.

London broil pot roast with carrots, baby potatoes, onions and thyme in the slow cooker crock

You are going to get tender and juicy results every time if you make London broil in the crockpot. Get ready because this slow cooked London broil pot roast is about to become your new favorite crockpot recipe!

why your whole family will love this slow cooker London broil pot roast recipe

Delicious Flavor
Classic Comfort Dish
Easy to Prepare
Simple Ingredients
Kid-friendly

This is a meal that I make often — my family can’t get enough of it!

Bowl of tender London broil pot roast with carrots, baby potatoes and caramelized onion gravy

ingredients

To make this easy London broil pot roast recipe, you’ll need a few ingredients that you can get at almost any grocery store or even online.

Here’s what we are working with:

London broil roast
salt and pepper
olive oil
beefy onion soup and dip mix packet
beef broth
onion
potatoes
carrots
garlic
Worcestershire sauce
fresh thyme sprigs
bay leaf
cornstarch

Hand holding a packet of Lipton Recipe Secrets Beefy Onion soup mix over the slow cooker

how to make London broil pot roast in the slow cooker

You’ll find the exact amounts and printable steps in the recipe card below. Here’s what each step looks like, plus the little things that make it work.

1. Season and sear the beef. Season the London broil with salt and pepper on both sides. Heat the olive oil in a skillet over medium-high heat and sear the beef for 2–3 minutes per side, then transfer it to a 6-quart crock pot. Searing builds the deep, browned flavor that makes this taste like a classic pot roast.

2. Build the broth. Add the sliced onion and minced garlic to the same skillet and sauté until the onion is translucent and fragrant, about 3–4 minutes. Stir in the onion soup mix packet, beef broth and Worcestershire sauce, scraping up the browned bits, then pour it all over the beef.

3. Add the vegetables and slow cook. Add the potatoes, carrots, bay leaf and thyme sprigs, season with salt and pepper and pour in 1 cup of water. Cover and cook on LOW for 8–10 hours or HIGH for 4–5 hours, until the beef is fork-tender. LOW gives the lean London broil the most time to get tender.

4. Rest the beef. Transfer the beef to a carving board to rest. Spoon the vegetables onto a serving platter and leave the broth in the crock pot for the gravy. Fish out the bay leaf and thyme stems.

for the gravy

5. Thicken the gravy. Whisk the cornstarch with cold water to make a smooth slurry, then whisk it into the broth. Turn the crock pot to HIGH and cook for another 10–15 minutes, until the gravy thickens. Mixing the cornstarch with cold water first keeps it from clumping.

6. Carve and serve. Slice the beef, ideally against the grain for the most tender bites, and serve it with the vegetables and plenty of gravy.

Whole seared London broil in the crock pot with carrots and potatoes, with a small bowl of gravy

can you use London broil for pot roast?

Yes. London broil is a lean cut that can turn out chewy when it’s cooked fast, but a long, slow braise in broth gives it time to turn tender, which makes it a great budget-friendly swap for a classic chuck roast. Searing it first and slicing it against the grain at the end make the biggest difference.

how long to cook London broil in a crock pot

Cook a 2½–3 lb London broil on LOW for 8–10 hours or on HIGH for 4–5 hours in a 6-quart crock pot, then add 10–15 minutes on HIGH to thicken the gravy. It’s ready when the beef pulls apart easily with a fork.

how to store leftover London broil pot roast

Refrigerate leftovers within 2 hours of cooking and enjoy them within 3–4 days. Store the beef and vegetables in the gravy so they stay moist, and reheat until steaming hot (165°F).

I hope you enjoy this simple slow cooker recipe as much as we do. It’s definitely one of those recipes worth saving. There’s nothing better than having what looks and tastes like a gourmet meal on the table, but one that saves you time behind the scenes.

Please leave us a star review and comment if you make this family loved recipe.

If you have any questions or comments, feel free to leave them below. I answer every single question as quickly as I can.

Happy cooking! And thanks for being part of our tribe, The Tasteful Tribe!

ENJOY!

London broil pot roast FAQs

Can you put London broil in a crock pot?

Yes. Slow cooking London broil with broth, onion soup mix and vegetables on LOW for 8–10 hours turns this lean cut into a tender pot roast.

Do I have to sear the London broil first?

Searing for 2–3 minutes per side isn’t strictly required, but it adds a deeper, browned flavor to the beef and the gravy, so we don’t skip it.

Should I cook London broil pot roast on low or high?

Both work: LOW for 8–10 hours or HIGH for 4–5 hours. LOW gives the lean meat more time to get tender.

How do you thicken the gravy?

Whisk cornstarch with cold water into a slurry, stir it into the broth in the crock pot and cook on HIGH for 10–15 minutes until thickened.

What potatoes are best for slow cooker pot roast?

We use small Yukon gold potatoes. They hold their shape during the long cook and turn creamy inside.

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