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Preheat oven to 375°F.
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In a large bowl, beat egg and milk with a fork until well-combined.
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(If your ground beef has been previously frozen and defrosted, use slightly less milk.).
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Tear bread into small pieces, and add to the bowl with salt, pepper, worcestershire sauce, and mustard, mix well.
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Add ground beef, onion and parsley; mix with hands until all liquid in absorbed and ingredients are well distributed. Mixture will be quite loose.
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Place meat mixture in a shallow casserole about 9 or 10 inches square and shape into a small, rectangular loaf.
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Spread ketchup over top of meat, and bake for 45 minutes.
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Remove from oven and let rest 5 minutes before slicing and serving.