In a bowl, combine the breadcrumbs and milk. Allow them to soak for a few minutes.

In a separate mixing bowl, add the ground beef, chopped onions, green bell pepper, minced garlic, Worcestershire sauce, salt, and black pepper.

Mix in the soaked breadcrumbs and milk, ensuring all the ingredients are well combined.

Shape the mixture into hamburger patties.

Heat a skillet over medium-high heat and add a bit of oil.

Place the hamburger patties in the skillet and cook them for about 4-5 minutes on each side until they are browned and cooked through.

Remove the patties from the skillet and set them aside.

In the same skillet, add 2 tablespoons of butter and melt it.

Add the thinly sliced onions and cook them until they become soft and caramelized.

Sprinkle the flour over the onions and stir well to create a roux.

Gradually add the beef broth while continuing to stir.

Let the mixture simmer and thicken to create a flavorful onion gravy.

Season with salt and pepper to taste.

Return the cooked hamburger patties to the skillet with the onion gravy.

Allow them to simmer in the gravy for a few minutes to absorb the flavors.

Serve the hamburger steaks hot, with the onion gravy spooned over the top.