In a skillet, cook beef, onion and garlic over medium heat until meat is no longer pink; drain. Add the tomato sauce, water, tomato paste, salt and oregano; mix well.
Spread 1/4 of the meat sauce in an ungreased 5 qt slow cooker. Arrange 1/3 of the noodles over sauce (break the noodles if necessary). Combine the cheeses; spoon 1/3 of the mixture over noodles. Repeat layers twice. Top with remaining meat sauce. Cover and cook in crock pot on low for 4-5 hours or until noodles are tender.
Yield: 6-8 servings