In a large bowl, combine cooked pasta, shredded chicken, marinara sauce, half of the mozzarella cheese, all of the Parmesan cheese, and Italian seasoning.
Transfer the mixture into a casserole dish and top with remaining mozzarella cheese.
Bake in the preheated oven for 25-30 minutes until cheese is bubbly and golden.
Notes
For an extra kick, sprinkle red pepper flakes before serving.