Prepare the Steak Patties:
In a large bowl, combine ground beef, breadcrumbs, egg, Worcestershire sauce, garlic powder, onion powder, salt, and black pepper. Mix gently until combined.
Shape the mixture into 4 oval patties.
Cook the Patties:
Heat 1 tbsp butter in a skillet over medium heat. Add the patties and cook for 4-5 minutes per side, until browned. Remove and set aside.
Make the Mushroom Gravy:
In the same skillet, add the remaining butter. Sauté onions and mushrooms until tender.
Sprinkle flour over the mushrooms and stir to create a roux. Gradually add beef broth, stirring constantly. Simmer until the gravy thickens.
Combine and Serve:
Return the patties to the skillet, coating them in the gravy. Simmer for 5-10 minutes.
Serve hot with mashed potatoes or your favorite sides.