For the Hamburger Steaks:

1. 1. In a large bowl, combine ground beef, half of the chopped onion, garlic powder, and Worcestershire sauce. Mix gently until combined.
2. 2. Divide the mixture into 4 equal portions and shape each into a patty about 1 inch thick. Make a small indentation in the center of each patty.
3. 3. Heat a skillet over medium-high heat with a drizzle of oil or butter. Sear patties for about 5 minutes on each side until browned and cooked through.

For the Brown Gravy:

1. 1. Remove the cooked patties from the skillet and set aside.
2. 2. In the same skillet, melt butter over medium heat. Whisk in flour until smooth to create a roux.
3. 3. Gradually add beef broth while whisking continuously to prevent lumps. Cook until thickened.
4. To Combine:
5. 1. Return the hamburger steaks to the skillet with the gravy, allowing them to simmer together for about 5 minutes for flavors to meld.
6. 2. Serve hot, spooning additional gravy over each patty.