In large bowl, mix ground beef, breadcrumbs, onion, milk, egg, salt and pepper. Use two hands and mix well.
In a separate small bowl, mix ketchup, mustard and brown sugar.
Lightly grease a shallow baking pan (13×9 is ideal), and shape beef mixture into a loaf. Cover with ketchup mixture and bake in oven for 45-55 minutes. Check with instant read thermometer. Internal temperature should be 160 degree F.
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