Slow Cooker Open-Faced Roast Beef Sandwich

A comforting roast beef sandwich with mashed potatoes and cheese.

This delectable open-faced roast beef sandwich is a comfort food classic, combining crusty bread, creamy mashed potatoes, and tender slow-cooked beef, sprinkled with cheese and au jus for a hearty meal.

Recipe Details

  • Prep Time: 30 minutes
  • Cook Time: 8 hours
  • Total Time: 8 hours 30 minutes
  • Servings: 8 sandwiches

Full Ingredient List

  • 5 pounds chuck or rump beef roast
  • 4 ounces au jus seasoning mix
  • 4 ounces dry Italian salad dressing mix
  • 32 ounces low-sodium beef broth
  • 4 cups mashed potatoes
  • 8 slices thick and crusty bread (e.g., Texas Toast)
  • 1/2 cup freshly shredded gruyere cheese
  • Salt, to taste
  • Black pepper, to taste
  • Nonstick cooking spray

Roast Beef and Au Jus

Tools and Equipment

  • Crockpot

Ingredients

Quantity Name Preparation Notes Substitutions
5 pounds beef roast Use chuck or rump cut. sirloin roast
4 ounces au jus seasoning mix 2 packages gravy mix
4 ounces dry Italian salad dressing mix 2 packages Italian seasoning
32 ounces low-sodium beef broth Use boxed or canned broth.
as needed nonstick cooking spray

Instructions

  1. Step 1: Spray your crockpot with nonstick spray. Place the beef roast inside and sprinkle with the au jus seasoning and Italian dressing mixes.
  2. Step 2: Pour the beef broth over the roast. Cook on high for 6-8 hours or until tender.
  3. Step 3: Once cooked, strain the broth into a bowl and reserve it. Shred or slice the beef into bite-sized sections, discarding fat and gristle.

Mashed Potatoes and Bread

Tools and Equipment

  • Broiler or toaster

Ingredients

Quantity Name Preparation Notes Substitutions
4 cups mashed potatoes mashed cauliflower
8 slices bread Thick and crusty, like Texas Toast. sourdough bread

Instructions

  1. Step 1: Prepare mashed potatoes according to your preferred recipe.
  2. Step 2: Toast the bread slices until golden brown. Broil for 2-4 minutes for extra thickness.

Assemble Sandwiches

Tools and Equipment

  • Knife
  • Fork

Ingredients

Quantity Name Preparation Notes Substitutions
1/2 cup freshly shredded gruyere cheese Swiss cheese
to taste salt Optional.
to taste black pepper Optional.

Instructions

  1. Step 1: Place a slice of toasted bread on a plate. Top with a portion of mashed potatoes.
  2. Step 2: Add a generous portion of shredded or sliced beef over the potatoes. Drizzle with reserved au jus. (Tips: Top with gruyere cheese at this step.)
  3. Step 3: Season with salt and pepper if desired. Serve hot with a knife and fork.

Nutritional Information

  • Calories: 769
  • Protein: 64g
  • Fat: 37g
  • Carbohydrates: 44g
  • Fiber: 3g
  • Sugar: 3g

Additional Information

Notes: Leftovers taste great cold and can be stored in separate containers to avoid sogginess.

Background: The open-faced roast beef sandwich is a classic comfort dish often enjoyed in home kitchens and diners.

Geographic Region: American

Seasonality: Best enjoyed in cooler weather but great year-round.

Occasion: Ideal for family dinners or casual gatherings.

Recommended Pairings

  • Red wine
  • Traditional coleslaw

Tags

comfort food crockpot beef sandwich dinner hearty slow cooker easy