Preheat the oven to 350°F (175°C).

In a large mixing bowl, combine ground beef, bread crumbs, egg, onion, garlic, Worcestershire sauce, ketchup, parsley, salt, and pepper.

Mix until just combined, being careful not to overwork the meat.

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

In a small bowl, mix together ketchup, brown sugar, and mustard.

Spread the topping mixture evenly over the meatloaf.

Bake in the preheated oven for 60 minutes, or until the internal temperature reaches 160°F (70°C).

Let the meatloaf rest for 10 minutes before slicing.