Preheat the oven to 350°F (175°C).

In a large mixing bowl, combine ground beef, breadcrumbs, chopped onion, milk, egg, garlic powder, salt, black pepper, and ketchup.

Transfer the meat mixture into a loaf pan and shape it into a loaf.

Spread a thin layer of ketchup over the top of the meatloaf.

Place the loaf pan in the oven and bake for about 1 hour.

While the meatloaf bakes, heat a skillet over medium heat, add flour and cook for a minute.

Slowly whisk in the beef broth and continue to cook until the gravy thickens.

Once the meatloaf is done, let it rest for a few minutes before slicing.

Serve warm, topped with the homemade gravy.