Fry hamburger and onions. Season ... to taste. Cook ziti 10 minutes only. Drain ziti. ... 4 slices of Mozzarella, then rest of mix ... 30-45 minutes until hot.
At least 1 1/2 hours ... and everything but ziti and Parmesan, in large enough ... and drained add Mozzarella, then sauce. Mix quickly ... at once with Parmesan.