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In a large skillet, brown the ground beef. Drain off the fat.
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In a large measuring cup, combine the milk, ketchup, dijon mustard, onion powder, and garlic powder. Pour this mixture over the ground beef.
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Add the shell pasta from your box of Shells & Cheese.
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Cover and simmer for 10 minutes, or until the pasta is cooked and most of the liquid has been absorbed.
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Turn off the heat. Stir in the cheese pouch and Greek yogurt.
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Top with green onions and enjoy!