Combine beef, onion, and garlic in large skillet. Cook until beef is
browned. Drain. Add tomato sauce, water, tomato paste, salt, and
oregano. Mix well. Spoon Enough of the beef mixture into the slow
cooker to cover the bottom. Layer some noodles over the beef
mixture, breaking as needed. Combine mozzarella, cottage, and
parmesan cheeses and mix well. Layer some of the cheese mixture
over the noodle layer. Repeat layers until ingredients are gone,
reserving some of the beef mixture for the top layer. Cook on low
4 hours or until the noodles are tender.
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