Cook mostaccioli in large amount of boiling water until almost tender, about 7 minutes. Drain. In a large pan, cook beef, onion, green pepper, and garlic until meat is browned. Drain off fat. Add undrained tomatoes, sauce, paste, undrained mushrooms, salt, sugar, basil, pepper, bay leaf, and water. Cook and simmer 30 minutes. Remove bay leaf and stir in noodles. Turn into a 9 X 13 inch dish. Sprinkle with Parmesan cheese. Cover with foil and bake 35 minutes at 350 degrees. Remove foil. Place mozzarella slices on top and bake a few minutes longer.
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