Preheat the oven to 375°F. Prepare a 9x13-inch baking dish with a light coating of nonstick cooking spray.
In a large stockpot, bring two quarts of salted water to a boil. Add the ziti and cook just until al dente, about 7-8 minutes. Drain and return the pasta to the pot.
Add the shredded chicken, marinara sauce, ricotta cheese, fresh basil, and half the Parmesan to the pot. Stir to combine, then season to taste with salt and pepper.
Spread half the pasta mixture in the prepared baking dish. Sprinkle with half the mozzarella.
Add the remaining pasta, then top with the rest of the mozzarella and Parmesan.
Cover with foil and bake for 15-20 minutes. Remove foil and bake for another 5-10 minutes, until the cheese is bubbling and golden brown.
Remove from oven and let the casserole rest for 5 minutes. Serve warm