In a large saucepan melt butter or margarine. Stir in carrots, celery, green pepper and onion. Cover and cook for 10 minutes, stirring frequently. Add zucchini, undrained tomatoes and tomato paste; mix well. Add bay leaves, garlic, parsley and seasonings. Cover and simmer for 30 minutes; remove cover and continue simmering 10 to 15 minutes more or until thickened to desired consistency. Stir in sliced mushrooms; cook 5 minutes more. Remove from heat; discard bay leaves.
In a 13x9-inch baking pan layer one-third of the noodles, vegetable sauce, cottage cheese and mozzarella. Repeat twice, ending with mozzarella. Sprinkle Parmesan over all. Cover with foil; place on a baking sheet. Bake at 350° F for 45 minutes; remove foil and continue baking 10 minutes more or until cheese is golden. Remove from oven; let stand 10 minutes before serving. If desired, garnish with snipped parsley.Servings: 8