Combine the ground beef, breadcrumbs, milk, onion, celery, carrot, ketchup, egg, Worcestershire sauce, salt, and pepper in a large bowl. Mix well until all ingredients are evenly distributed.
Transfer the meat mixture to a loaf pan and shape it into a loaf.
Bake the meatloaf for 1 hour or until the internal temperature reaches 160 degrees Fahrenheit.
Let the meatloaf rest for 10 minutes before slicing and serving.
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