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Stir together egg, milk, garlic powder, onion and bread crumbs.
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Mix in ground beef.
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Divide meat mixture into 20 equal sized pieces.
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Cut cheese into 20 equal sized pieces.
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Roll each piece meat around a piece of cheese, making sure to completely seal the cheese inside of the ball.
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Preheat oil in skillet.
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Add meatballs to pan.
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Brown lightly on all sides.
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When meatballs are browned cover with spaghetti sauce and bring to a boil.
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Reduce heat to a simmer, cover and cook 10 more minutes.
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Serve over you favorite pasta, or make a sub sandwich.