Preheat the oven to 350°F (175°C).

In a large mixing bowl, combine 1 ½ pounds ground beef, 1 cup breadcrumbs, 1 egg, 1 small onion (finely chopped), 1 cup milk, 1 tablespoon Worcestershire sauce, 1 teaspoon salt, and ½ teaspoon black pepper.

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

In a separate bowl, mix together ½ cup ketchup and ½ cup brown sugar to create the glaze.

Spread the glaze evenly over the top of the meatloaf.

Place the loaf pan on a baking sheet and bake for about 1 hour.

Check for doneness with a meat thermometer to ensure the internal temperature reaches 160°F (70°C).

Let the meatloaf rest for about 10 minutes before slicing.