Prep all ingredients before cooking to ensure a smooth process.
Combine all beef patty ingredients except olive oil in a bowl and form into four patties.
Heat olive oil in a skillet and fry patties for 5-6 minutes on each side until browned.
Sauté onions and mushrooms in the same skillet until seared, about 7-9 minutes.
Add butter to the skillet, then sprinkle in flour and cook for 1-2 minutes.
Gradually whisk in beef broth to create a smooth gravy.
Add Worcestershire sauce and garlic powder to the gravy and stir well.
Combine cooked onions, mushrooms, and beef patties in the skillet and simmer for 5-7 minutes.