Make the Mashed Potatoes:

• Boil peeled and cubed potatoes in salted water for 15 minutes or until tender.
• Drain and mash with butter, milk, salt, and pepper until smooth. Set aside.

Prepare the Salisbury Steak Patties:

• In a bowl, combine ground beef, breadcrumbs, milk, egg, Worcestershire sauce, garlic powder, onion powder, salt, and pepper.
• Shape into 4 oval patties.

Cook the Patties:

• Heat olive oil in a skillet over medium-high heat.
• Cook patties for 4–5 minutes per side until browned and cooked through. Remove from skillet.

Make the Gravy:

• In the same skillet, add beef broth, soy sauce, and mushrooms (if using).
• Simmer, then add cornstarch mixed with water if a thicker gravy is desired.

Combine and Serve:

• Return patties to skillet, spoon gravy over them, and cook for 2–3 minutes.
• Serve over mashed potatoes with extra gravy on top.