Instructions:
Preheat oven to 350°F (175°C).
In a large bowl, mix together the ground beef, breadcrumbs, milk, egg, chopped onion, salt, and black pepper.
Transfer the mixture to a loaf pan, and shape it into a loaf.
Spread ketchup over the top of the meatloaf.
Bake for 1 hour, or until the internal temperature of the meatloaf reaches 160°F (71°C).
Let the meatloaf cool for a few minutes before slicing and serving
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