Prepare the Hamburger Steaks:

• In a large mixing bowl, combine ground beef, egg, breadcrumbs, chopped onion, garlic powder, Worcestershire sauce, salt, and black pepper.
• Gently mix until just combined; do not overmix.
• Divide the mixture into 4 equal portions and shape into oval patties.

Cook the Steaks:

• Heat a large skillet over medium-high heat. Add a drizzle of oil or a small pat of butter.
• Cook the patties for 4-5 minutes per side, or until browned and cooked through (internal temperature of 160°F).
• Remove the patties from the skillet and set aside.

Make the Onion Gravy:

• In the same skillet, melt the butter over medium heat. Add the sliced onions and sauté for 5-7 minutes, stirring occasionally, until softened and caramelized.
• Sprinkle flour over the onions and stir well to coat. Cook for 1-2 minutes to remove the raw flour taste.
• Slowly pour in the beef broth while whisking to prevent lumps. Add Worcestershire sauce, salt, and pepper.
• Simmer for 5-7 minutes, stirring frequently, until the gravy thickens.

Combine and Serve:

• Return the hamburger steaks to the skillet with the onion gravy. Spoon gravy over the patties and simmer for 2-3 minutes to meld flavors.
• Serve hot with mashed potatoes, rice, or your favorite side dish.