Bring a large pot of lightly salted water to a boil. Add ziti pasta, and cook about 8 minutes or until done, then drain.
In a large skillet, brown onion and ground beef over medium heat. Add spaghetti sauce, and simmer 15 minutes.
Preheat oven to 350 F. Butter a 9x13 inch baking dish. Layer as follows- 1/2 of the ziti, provolone cheese, sour cream, 1/2 of sauce mixture, remaining ziti, mozzarella cheese, and remaining sauce mixture. Top with grated parmesan cheese.
Bake for 30 minutes in the preheated oven, or until cheeses are melted.
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