Preheat your oven to 350°F (175°C).

In a large mixing bowl, combine the ground beef, stovetop stuffing mix, and finely diced onion. Add eggs, Worcestershire sauce, ketchup, black pepper, salt, garlic powder, and milk. Mix gently until just combined.

Grease a loaf pan and spoon the meat mixture into it, smoothing the top.

Bake for 30 minutes in the preheated oven.

While baking, mix together the topping ingredients: ketchup, brown sugar, and Worcestershire sauce.

After 30 minutes, spread the topping evenly over the meatloaf and return to the oven for an additional 15-30 minutes, ensuring an internal temperature of 160°F (71°C).

Let the meatloaf rest for 15 minutes before slicing and serving.