• Gather all your ingredients before starting.
• Combine the beef, egg, Worcestershire sauce, mustard, garlic, breadcrumbs, onion powder, salt, and pepper. Mix well and shape into four oval patties.
• Heat olive oil in a large skillet over medium-high heat.
• Fry the patties for 5 to 6 minutes on each side until they achieve a deep brown color. Transfer to a plate.
• In the same skillet, add the onion and mushrooms.
• Sauté for about 7 to 9 minutes until the moisture evaporates and they are nicely seared. Transfer these to the plate with the patties.
• Reduce the heat to medium and melt the butter in the skillet.
• Sprinkle in the flour, stirring continuously for 1 to 2 minutes until a roux forms.

Completing the Gravy

• Gradually whisk in the beef broth ensuring there are no lumps.
• Add the Worcestershire sauce and garlic powder for extra flavor.

Simmering Everything Together

• Return the onions, mushrooms, and patties to the skillet.
• Let everything cook together for 5 to 7 minutes until the patties are cooked through and the sauce thickens. If needed, add a splash of water or broth to adjust consistency.
• Serve the Salisbury Steak immediately with a sprinkle of salt and pepper to taste.