In a large bowl, combine ground beef, breadcrumbs, milk, egg, chopped onion, Worcestershire sauce, salt, and pepper. Mix well until all ingredients are evenly distributed.
Shape the mixture into a loaf and place it in a baking pan.
In a small bowl, whisk together ketchup, brown sugar, and Dijon mustard for the glaze.
Spread the glaze evenly over the top of the meatloaf.
Bake for 60 minutes, or until the internal temperature reaches 160°F (71°C).
Let the meatloaf rest for 10 minutes before slicing and serving.
Notes
This meatloaf is delicious served with mashed potatoes and green beans.