Bring a large pot of lightly salted water to a boil.
Add ziti pasta, and cook until al dente, about 8 minutes;
drain.
In a large skillet, brown onion and ground beef over medium
heat.
Add spaghetti sauce, and simmer 15 minutes.
Preheat the oven to 350 degrees F (175 degrees C).
Butter a 9x13 inch baking dish.
Layer as follows- 1/2 of the ziti, Provolone cheese, sour cream,
1/2 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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