For the Patties:

1. 1. In a large bowl, combine ground beef, breadcrumbs, half of the chopped onion, garlic powder, salt, and pepper. Mix until just combined; avoid overworking the meat.
2. 2. Form the mixture into four equal-sized patties.

For the Gravy:

1. 3. In a large skillet over medium heat, add a splash of oil. Sauté remaining chopped onions until translucent, about 5 minutes.
2. 4. Push onions to one side and add patties to the skillet. Cook for about 4 minutes on each side until browned but not fully cooked through.
3. 5. Pour in beef broth and Worcestershire sauce; scrape up brown bits from the pan for added flavor.
4. 6. In a small bowl, mix cornstarch with water until smooth. Stir this into the simmering skillet and let it thicken for a couple of minutes.
5. 7. Serve patties topped with gravy alongside mashed potatoes or rice.