Layer ingredients in this sequence: 1/2 of the ziti, provolone cheese, sour cream, 1/2 of the pasta sauce, remaining 1/2 of the ziti, mozzarella cheese, remaining 1/2 of the pasta sauce
5
Sprinkle parmesan cheese on top
6
Bake in oven, preheated to 350 degrees, for 30 minutes or until bubbly.