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–+ servings
open faced roast beef sandwiches on a plate

Open Faced Roast Beef Sandwich Recipe

Course: Main Course
Cuisine: American
Prep Time: 30 minutes
Cook Time: 8 hours
Total Time: 8 hours 30 minutes
Servings: 8 sandwiches
Calories: 769kcal
Author: Becky Hardin
Nothing is more delicious than tender slow cooked roast beef, creamy mashed potatoes, and cheese piled onto a hot open faced sandwich. I love the way the bread sops up the au jus!
Step-by-step photos can be seen below the recipe card.
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Equipment

Ingredients

  • 5 pounds beef roast such as chuck or rump
  • 4 ounces au jus seasoning mix (2 packages)
  • 4 ounces dry Italian salad dressing mix (2 packages)
  • 32 ounces low-sodium beef broth
  • 4 cups mashed potatoes (click for recipe)
  • 8 slices bread thick and crusty, such as Texas Toast
  • ½ cup freshly shredded gruyere cheese

Instructions

  • Spray your crockpot with nonstick spray. Place the beef roast inside and sprinkle with the four packets of seasoning.
    5 pounds beef roast, 4 ounces au jus seasoning mix, 4 ounces dry Italian salad dressing mix
    A person is adding seasoning to a slow cooker to prepare a delicious open faced roast beef sandwich.
  • Pour the beef broth over the roast.
    32 ounces low-sodium beef broth
  • 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.
    4 cups mashed potatoes
  • Toast the bread. For extra-thick slices, broil for 2-4 minutes until golden.
    8 slices bread
  • 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.
    ½ cup freshly shredded gruyere cheese
  • Serve with a knife and fork. Enjoy!

Video

Notes

  • 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.
Storage: Store the open faced roast beef sandwich components in separate airtight containers in the refrigerator for up to 4 days or in the freezer for up to 3 months.

Nutrition

Calories: 769kcal | Carbohydrates: 44g | Protein: 64g | Fat: 37g | Saturated Fat: 16g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 18g | Trans Fat: 2g | Cholesterol: 205mg | Sodium: 2200mg | Potassium: 1544mg | Fiber: 3g | Sugar: 3g | Vitamin A: 119IU | Vitamin C: 24mg | Calcium: 175mg | Iron: 7mg