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Preheat oven to 350 degrees, and set out muffin tins.
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Break egg into a large bowl and beat with fork.
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Add beef, bread crumbs and salt. Mix well.
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Add onion. Mix well.
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Press mixture into muffin tins. Bake 10 minutes.
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While meat loaves are cooking, mix catsup, brown sugar and dry mustard in a small bowl.
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Pour sauce over loaves, and bake another 5-10 minutes or until they are done (at least 160 degrees) in center.