Brown beef and onions in skillet. Stir in tomatoes, tomato paste, seasonings and brown sugar. Simmer 30 minutes or until thick. Meanwhile, cook spaghetti, drain and rinse. Toss spaghetti with cottage cheese. Spread over bottom of 9"x13" baking pan. Sprinkle with the mozzarella. Spoon sauce over and top with the parmesan. Bake uncovered 45 minutes at 325° or until hot and bubbly.
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