Preheat the oven to 350 degrees. Butter a 9x13 inch baking dish and set aside.
Bring a large pot of lightly salted water to a boil. Add ziti pasta, and cook until al dente, about 8 minutes; drain and toss with a light coating of olive oil.
2.
In a large skillet over medium heat, brown onion and ground beef. Add spaghetti sauce, and simmer 15 minutes. Season with salt and pepper.
3.
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.
4.
Bake for 30 minutes in the preheated oven, or until cheeses are melted. Allow to cool for 2 minutes and garnish with chopped parsley.
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