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Slow Cooker London Broil

The Best Slow Cooker London Broil

Slow Cooker London Broil is moist and tender, cooked slowly in delicious herb-infused gravy for six to ten hours until it is fall-apart tender.
Course Main Course
Cuisine American
Keyword Slow Cooker London Broil
Prep Time 20 minutes
Cook Time 8 hours
Total Time 8 hours 8 minutes
Servings 6 servings
Calories 623kcal
Author Catalina Castravet


  • 5 lbs London Broil beef cut
  • 3 tablespoons canola oil
  • 1 onion quartered
  • 5 cloves garlic minced
  • 1/2 teaspoon ground thyme
  • 1/4 teaspoon red pepper flakes
  • 1/4 teaspoon salt or to taste
  • 1/4 teaspoon pepper or to taste
  • few bay leaves optional
  • 2 tablespoons Worcestershire sauce
  • 1 cup red wine or beef broth
  • 2 cups beef broth
  • 1 can (10 1/2 oz) cream of mushroom soup condensed
  • 4 tablespoons unsalted butter diced
  • 10 mini red potatoes cut in half
  • 1 1/2 cups carrots cut into 2" chunks or use whole mini carrots

Optional Cornstarch Slurry:

  • 3 tablespoons cornstarch
  • 1/4 cup water


  • First, pat dry beef with paper towels and season with salt and pepper on each side.
  • Place a large cast iron pan or Dutch oven on the stove over medium-high heat. Once hot, add oil, and sear beef on all sides for about 1-2 minutes on each side, until golden brown in color.
  • Transfer the meat to an 8 qt slow cooker. Add the rest of the ingredients, except carrots and potatoes, and add the butter last on top of the beef. Gently stir to combine.
  • Put the lid on the crockpot and cook for 5-6 hours on high, or 8-10 hours on low.
  • If you want to add carrots and potatoes, add them to the slow cooker when there are 2-3 more hours of cooking left. Cover and continue cooking until tender.

Optional Cornstarch Slurry:

  • Combine cornstarch and water in a small bowl until cornstarch is fully dissolved. Add the mixture to the slow cooker when one hour of cooking is left. Gently stir. This will thicken the gravy. Check after 30 minutes, and if needed add more.
  • Once done, transfer the London Broil to a serving platter and carve. Arrange the potatoes and carrots around the roast. Garnish with fresh chopped parsley and drizzle with the gravy before serving.



Calories: 623kcal | Carbohydrates: 5g | Protein: 89g | Fat: 21g | Saturated Fat: 6g | Cholesterol: 231mg | Sodium: 935mg | Potassium: 1595mg | Fiber: 0g | Sugar: 1g | Vitamin A: 335IU | Vitamin C: 2.5mg | Calcium: 106mg | Iron: 8.2mg