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Pot Roast Open Faced Sandwich
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5 from 2 votes

Hot Beef Sandwiches with Mashed Potatoes and Gravy

Hot Beef Sandwiches with Mashed Potatoes and Gravy are an open-faced sandwich that is pure comfort food. White bread is toasted, covered with mashed potatoes, leftover shredded pot roast and gravy. It's an easy way to turn leftover pot roast into a hearty and delicious meal.

Course Lunch
Cuisine American
Keyword beef sandwich
Prep Time 10 minutes
Cook Time 25 minutes
Servings 4



  • 2 medium russett potatoes, peeled and cut into chunks
  • 4 tablespoons salted butter
  • 1/4 cup milk
  • 1/2 cup sour cream


  • 3 tablespoons all-purpose flour
  • 2 cups beef broth
  • 1 tablespoon butter
  • 1 spring rosemary
  • 1/2 cup leftover sauce from pot roast
  • 1 teaspoon red wine vinegar
  • 1 1/2 cups leftover shredded pot roast


  • 4 slices Texas Toast
  • 4 tablespoons butter, softened
  • 1/4 teaspoon garlic powder
  • chopped fresh parsley, optional


  • Cook potatoes in a pot of boiling salted water until fork tender, about 15 minutes.
    While potatoes are cooking, combine butter and milk in a glass measuring cup or microwave-safe bowl and microwave for 30 to 40 seconds to melt the butter and warm the milk.
  • Drain potatoes and return to pot. Cook over low heat for 30 seconds to evaporate excess moisture.
  • Add sour cream and the milk/butter mixture. Mash until smooth. Season to taste with salt and pepper.
  • To make gravy, whisk together flour and beef broth in a bowl.
  • Melt 1 tablespoon butter in a saucepan or skillet.. Add rosemary and saute for 1 minute. Discard rosemary.
  • Whisk in broth mixture and reserved pot roast sauce and simmer for 5 minutes to thicken.
  • Stir in vinegar and pot roast. Season to taste with salt and pepper. Keep warm.
  • Spread butter on one side of each piece of bread. Sprinkle with garlic powder. Toast in a toaster oven until golden.
  • To assemble sandwiches, place a scoop of mashed potatoes on each piece of toast. Top with pot roast gravy and sprinkle with parsley.