Preheat the oven to 350 F. Cook the pasta according to package instructions until al dente in a pot of salted boiling water. Drain.
In a large bowl combine the cooked chicken, Marinara sauce, 1 cup shredded mozzarella, ½ cup grated Parmesan, Italian seasoning, and cooked pasta.
Place this mixture in a 9x13-inch casserole dish, cover with foil and bake for 30 minutes.
Take the casserole out of the oven and sprinkle the breadcrumbs, remaining mozzarella, and Parmesan cheeses evenly on top. Continue baking it, uncovered, for 10-12 minutes or until the breadcrumbs are slightly golden and the cheeses have melted.
Serve with freshly chopped basil on top.