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Combine the ground beef, breadcrumbs, garlic powder, milk, egg, Worcestershire sauce, salt, and pepper in a big bowl.
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Stir well until the ingredients are well incorporated and the mixture is smooth.
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Split the amalgamation into four equal portions and sculpt each of them into a circular patty shape.
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Warm a large skillet over medium-high heat.
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Next, add the patties and cook them for 3-4 minutes per side or until they are fully cooked and have a browned appearance.
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Once done, place them on a plate and cover them to retain warmth.
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In the identical skillet, melt butter over medium heat and then add onions and garlic to sauté.
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Cook the mixture until they become tender, which should take approximately 5-7 minutes.
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Scatter the flour on top of the onions and garlic, and blend them together.
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Keep stirring for roughly 1-2 minutes or until the blend becomes a light brown shade.
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Slowly incorporate the beef broth into the mixture, stirring constantly to prevent any lumps from forming.
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After bringing the sauce to a simmer, let it cook for a few minutes until it thickens.
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Add the heavy cream and continue cooking for 1-2 minutes until the sauce is heated and has thickened to your liking.
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For a tasty twist on your hamburger steaks, drizzle them with creamy onion gravy and sprinkle with some chopped parsley to add a pop of color and flavor.