Creating Bobby Flay Salisbury Steak is an uncomplicated process. Follow these simple steps to craft your delicious dish:

1. Prepare the Patties: In a large bowl, combine ground beef, breadcrumbs, egg, onion, garlic, Worcestershire sauce, mustard, salt, and pepper. Mix until well combined.
2. Form the Patties: Shape the mixture into four equal-sized oval patties. Ensure they are compact and well-formed.
3. Heat the Pan: In a large skillet, heat olive oil over medium-high heat.
4. Cook the Patties: Add the patties to the skillet and cook for 4-5 minutes on each side, until they are browned and cooked through. Remove the patties from the pan and set aside.
5. Make the Gravy: In the same skillet, add sliced mushrooms and cook until they are golden brown, about 3-4 minutes.
6. Prepare the Roux: Sprinkle flour over the mushrooms and stir to combine, cooking for an additional minute.
7. Add Broth: Gradually add beef broth, stirring constantly to prevent lumps. Bring the mixture to a simmer, allowing it to thicken.
8. Return the Patties: Place the cooked patties back into the skillet, coating them with the gravy. Let them simmer together for 2-3 minutes.
9. Taste and Adjust: Season the gravy with salt and pepper to taste.
10. Serve: Remove from heat and garnish with fresh parsley.

This method will leave you with perfectly cooked Salisbury steaks enveloped in rich and flavorful gravy.