1In a large bowl, combine the ground beef, breadcrumbs, milk, finely chopped onion, egg, Worcestershire sauce, garlic powder, onion powder, salt, and pepper. Mix until well combined. Shape the mixture into 4-6 patties.
2Heat the olive oil in a large skillet over medium-high heat. Add the patties and cook for 3-4 minutes on each side, until browned. Remove the patties from the skillet and set aside.
3In the same skillet, add the butter and sliced onions. Cook for about 5 minutes until the onions are softened. Add the sliced mushrooms and cook for an additional 3-4 minutes.
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