Preheat the oven to 350° and lightly spray a 9x13 inch baking dish with cooking spray. Set aside.
Bring a pot of salted water to a boil. Cook the penne according to the package directions for al dente pasta.
Drain the pasta and add it to a large bowl.
Pour ¾ of the jar of marinara sauce on the pasta. Add the Italian seasoning, salt, pepper, and garlic powder. Stir together until everything is well incorporated.
Pour the pasta into the prepared baking dish.
Layer 1 cup of the mozzarella cheese on top of the pasta and spread evenly.
Add the baked, cubed chicken on top of the mozzarella and spread evenly.
Cover the chicken with the remaining marinara sauce.
Spread the remaining ⅓ cup mozzarella cheese as well as the parmesan on top of the chicken.
Bake for 30-35 minutes or until chicken is done and no longer pink inside.
Top with fresh basil and serve warm.