Cook beef and onion, drain. Stir in mushrooms, tomato sauce, pizza sauce, tomato paste, sugar, and seasonings. Drain pasta, stir into the meat sauce.
Divide 1/2 mix between 11X7X2 baking dishes, sprinkle each with 1 cup mozzarella cheese. Repeat. Top with Parmesan cheese. Cover and bake at 350 degrees for 20 minutes. Uncover, bake 10-15 minutes.