Boil the pasta accorsing to package directions, about 8 mins or until al dents. Drain.
In large skillet, brown onion and sausage over medieum heat. Add speghetti sauce and simmer 15 mins.
Preheat oven to 350?. Butter a 9x13 baking dish.
Layer as follows:
? ziti, provolone cheese, sourcream, ? suace mixture, remaining ziti, mozzarella cheese and remaining sauce. Top with parmesan cheese.
Bake for 30 mins, or until chesses are melted. Allow to stand for 15 mins.
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