cook the beef and onion in a 12 in skillet until the beef is well browned. Pour off fat. Spoon the beef mixture into a 13x9 shallow baking dish. Stir the soup, water, carrots (thawed) noodles (pre-cooked) and sour cream into the dish. COVER
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Bake at 375 for 30 minutes or until hot and bubbly.