Preparation Steps

• In a large bowl, combine the ground beef, bread crumbs, milk, egg, salt, and pepper. Mix gently until just combined. Do not overmix.
• Form the mixture into 4 oval-shaped patties.
• In a large skillet, melt the butter over medium-high heat. Add the onion and cook until softened, about 5 minutes.
• Add the sliced mushrooms to the skillet and cook until they are browned and their liquid has evaporated, about 8-10 minutes.
• Remove the vegetables from the skillet and set aside. Add the Salisbury steak patties to the skillet and brown them on both sides, about 3-4 minutes per side. Remove patties from the skillet and set aside.
• Reduce the heat to medium. Sprinkle the flour into the skillet and whisk for about 1 minute until it forms a paste with the drippings.
• Gradually whisk in the beef broth and Worcestershire sauce until smooth. Bring to a simmer, scraping up any browned bits from the bottom of the skillet.
• Return the cooked patties and the sautéed vegetables to the skillet. Cover and simmer for 15-20 minutes, or until the patties are cooked through and the gravy has thickened.
• Serve hot, spooning the gravy over the Salisbury steak.