Preheat your oven to 350°F (175°C). This ensures your meatloaf cooks evenly throughout.

In a large bowl, combine the ground beef, breadcrumbs, chopped onion, milk, eggs, Worcestershire sauce, salt, and black pepper. Gently mix the ingredients until they are well combined—avoid overmixing to keep the texture light and fluffy.

Form the mixture into a loaf shape and transfer it to a greased baking dish or a lined loaf pan. Ensure it holds its shape well.

Spread the ketchup evenly over the top of the meatloaf. This will create a wonderful glaze while baking.

Bake in the preheated oven for approximately 1 hour or until the internal temperature reaches 160°F (70°C).

Once cooked, let it rest for 10 minutes before slicing to allow the juices to redistribute properly for maximum flavor.