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open faced roast beef sandwiches on a plate

Open-Faced Roast Beef Sandwiches

Course: Main Course
Cuisine: American
Prep Time: 30 minutes
Cook Time: 8 hours
Total Time: 8 hours 30 minutes
Servings: 8
Calories: 591kcal
Open-Faced Roast Beef Sandwiches are real crowd pleasers, made with just a few ingredients that provide layers of flavor and texture. The beef is cooked in a slow cooker for an easy hands-off recipe with minimal prep. 
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  • 5 lbs. beef roast such as chuck, or rump
  • 2 packages au jus seasoning mix 2 ounces each
  • 2 packages dry Italian salad dressing mix 2 ounces each
  • 32 ounces beef broth homemade or packaged
  • 4-6 slices bread thick and crusty, such as Texas Toast
  • mashed potatoes (See Note 1)
  • 1/2 cup gruyere cheese shredded


  • Spray slow cooker with nonstick spray. Place the beef roast inside and sprinkle with the four packets of seasoning.
  • Pour Beef Broth over the roast.
  • Cook on high for 6-8 hours or until tender.
  • When cooked, strain the broth into a bowl and reserve.
  • Shred or slice the beef into small bite-sized sections. Discard away any fat and gristle.
  • Prepare the mashed potatoes. (See Note 1.)
  • Toast the bread. For extra-thick slices, broil for 2-4 minutes until golden.
  • Assemble the open-faced sandwiches by placing the toasted bread on a plate and topping it with mashed potatoes. Add a generous portion of the shredded/sliced beef. Drizzle a couple of spoonfuls of the reserved au jus over the meat and sprinkle with gruyere cheese.
  • Serve with a knife and fork. Enjoy!


  • Use my recipe for make-ahead mashed potatoes, cook up your own, or buy prepared mashed potatoes at the store.
  • Be sure to spray the slow cooker with nonstick spray before adding the other ingredients.
  • The beef is the star of the show, so use the best quality you can. You won't regret it!
  • Don't assemble the sandwiches until right before serving--the juices will make the toast soggy.


Calories: 591kcal | Carbohydrates: 7g | Protein: 60g | Fat: 36g | Saturated Fat: 16g | Cholesterol: 205mg | Sodium: 805mg | Potassium: 1035mg | Fiber: 1g | Sugar: 1g | Vitamin A: 115IU | Calcium: 158mg | Iron: 7mg