My Ultimate Salisbury Steak Recipe: Mushroom Gravy Magic!

Ingredients

• 1 1/2 lbs (680g) ground beef (80/20 blend recommended)
• 1 medium onion, finely chopped (approx. 1 cup)
• 1 large egg, lightly beaten
• 1/2 cup panko breadcrumbs
• 2 tablespoons ketchup
• 2 tablespoons Worcestershire sauce
• 1 teaspoon Dijon mustard
• 1 teaspoon garlic powder
• 1/2 teaspoon onion powder
• 1/4 teaspoon black pepper
• 1/2 teaspoon salt (or to taste)
• 2 tablespoons vegetable oil, for searing
• 2 tablespoons unsalted butter
• 8 oz (225g) cremini mushrooms, sliced
• 1/2 medium onion, finely chopped
• 2 cloves garlic, minced
• 2 tablespoons all-purpose flour
• 2 cups beef broth
• 1/4 cup dry red wine (optional)
• 1 tablespoon Worcestershire sauce
• 1 teaspoon dried thyme