Prepare the Ingredients: Gather all the ingredients before you start cooking.
Mix the Beef Mixture: In a large bowl, combine the ground beef, 1/3 cup of the condensed soup, bread crumbs, egg, salt, and black pepper. Mix well to incorporate all the ingredients evenly.
Shape the Patties: Form the mixture into 6 oval patties.
Cook the Patties: Heat a large skillet over medium-high heat. Add the patties and brown them on both sides. Drain any excess fat from the skillet.
Make the Gravy: In a small bowl, whisk together the remaining soup and flour until smooth. Stir in the ketchup, water, Worcestershire sauce, and mustard powder until fully combined.
Simmer the Patties: Pour the gravy mixture over the patties in the skillet. Cover the skillet and cook on low heat for about 20 minutes, stirring occasionally to ensure the sauce doesn’t stick.
Serve: Once the patties are fully cooked and the sauce has thickened, serve them warm. Enjoy your homemade Salisbury steak!