In a mixing bowl, gently combine the ground beef with salt, pepper, garlic powder, and paprika until just blended. Shape the mixture into uniform patties, about ¾ inch thick, making a small indentation in the center of each.

Heat a splash of oil in a large skillet over medium heat. Carefully place the patties in the skillet without overcrowding. Cook for 5-7 minutes on each side, or until deeply browned and cooked through.

In the same skillet, add a little more oil if needed, then sauté the sliced onions over medium heat for about 10-15 minutes, stirring frequently, until soft and caramelized.

Pour the beef broth into the skillet with the caramelized onions and stir to combine. Gradually whisk in the cornstarch, ensuring no lumps, and simmer until the gravy thickens.

Nestle the cooked hamburger steaks back into the skillet with the onion gravy and let everything simmer together for an additional 5 minutes.