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Photo of plated Slow Cooker French Onion Roast Beef with mashed potatoes sliced carrots brussels sprouts and gravy
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4.50 from 2 votes

Slow Cooker French Onion Roast Beef

This Slow Cooker French Onion Roast Beef, or Slow Cooker French Onion Pot Roast, is made with a rump roast and homemade or canned French Onion Soup. With just five minutes prep time, it's ready to eat in less than six hours.
Prep Time5 minutes
Cook Time6 hours 10 minutes
Total Time6 hours 15 minutes
Course: MAIN COURSES/ENTRÉES
Cuisine: American
Keyword: slow cooker French onion pot roast recipe, slow cooker roast beef recipe, slow cooker roast beef with French onion soup
Servings: 8
Calories: 286kcal
Author: Bernadette

Ingredients

  • 3 pounds beef rump roast
  • 2 cups sliced carrots
  • 10 ½ ounces canned French Onion soup (1 can, or 20 ounces homemade, omit water)
  • 1 cup water
  • black pepper , to taste
  • 3 tablespoons cornstarch (or flour)

Instructions

  • Place the rump roast in the bottom of the slow cooker pot. Add two cups of sliced carrots.
  • Pour in one can of French onion soup and one can water, or 20 ounces of homemade. Sprinkle with pepper and also salt if using homemade French onion soup.
  • Cover and cook on HIGH for 5 to 6 hours or on LOW for about 10 hours, depending on how well done you want your roast. If a more rare roast is desired, check the beef at about 3 hours on HIGH or 7 hours on LOW.
  • About 10 minutes before serving, remove the roast to a cutting board, and the carrots and onions to a bowl, leaving the broth in the slow cooker. Wisk the cornstarch or flour with a little bit of water ( enough to make a thin paste) and pour into the broth, stir well for about 1 minute, and leave to thicken while you slice the beef. You can also remove the broth to a small pot and prepare the gravy on the stove, by bringing the broth to a boil, adding the cornstarch mixture and wisking for 1 minute. The stove top method will result in a slightly thicker gravy.
  • Top sliced beef with the gravy, and serve with whatever sides you like.

Nutrition

Calories: 286kcal | Carbohydrates: 9g | Protein: 35g | Fat: 11g | Saturated Fat: 4g | Cholesterol: 105mg | Sodium: 365mg | Potassium: 638mg | Fiber: 1g | Sugar: 4g | Vitamin A: 5345IU | Vitamin C: 1.9mg | Calcium: 17mg | Iron: 2.9mg