Bring large pot of lightly salted water to a boil. Add ziti pasta, cook until al dente, about 8 minutes and drain.
In a large skillet, brown ground beef and onion over medium heat. Drain of needed. Add spaghetti sauce and simmer for 15 minutes. Preheat oven to 350°. Spray a 9x13 inch baking dish with cooking spray. Layer 1/2 of ziti pasta, all of the Provolone cheese, all of the sour cream, 1/2 tomato sauce mixture, remaining ziti, all of the shredded mozzarella cheese, the remaining tomato sauce mixture and finish with all the grated Parmesan cheese.
Bake uncovered in a 350°, preheated oven for 30 minutes.
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