To make the steak patties, mix together the ground beef, bread crumbs, ketchup, worcestershire sauce, dry mustard, egg, salt and pepper.

Divide the beef mixture into 4 equal portions, then form each portion into a round patty about 1/2" thick.

Heat about a tablespoon of oil in a large skillet. Add the burgers and sear each side for about 3 minutes. Remove from the skillet and set aside.

In the same skillet, melt the butter. Add the onion and mushrooms and cook until tender and browned. Stir in the flour and cook, stirring, for about 1 minute.

Slowly add the beef broth and whisk to remove any clumps. Stir in the worcestershire sauce, dried thyme, and garlic powder, and cook until just slightly thickened.

Return the beef patties to the skillet, along with any juices that collected on the plate. Cover and simmer until the patties have cooked through completely and the gravy has thickened, about 10 minutes.