In a large skillet over medium heat, heat the olive oil.
Add the ground beef, onion, celery, bell pepper, garlic powder, Worcestershire sauce, salt, and pepper. Cook and stir until the beef is cooked through and the vegetables are tender, about 10 minutes.
Add the bread crumbs, beef broth, parsley, and thyme. Stir to combine and cook for another 5 minutes.
Divide the mixture into 4 equal portions and form into patties. Set aside.
In the same skillet, melt the butter over medium heat. Add the mushrooms and cook until they are tender, about 5 minutes.
Add the cream and bring to a simmer. Add the patties and simmer for 10 minutes more, or until cooked through.
Serve the patties with the mushrooms and sauce.
Interesting Facts
Salisbury steak was invented by J.H. Salisbury in the late 19th century.
The original recipe called for a mixture of ground beef, onions, and breadcrumbs.
Mushrooms are a great addition to Salisbury steak, as they add a rich, earthy flavor.
This recipe is a great way to use up leftover beef broth.