Creating your Hearty High Protein Chicken Parmesan Casserole is a breeze when you follow these simple steps:

1. Preheat your oven to 375°F (190°C).
2. Prepare the Chicken: In a large bowl, combine the shredded chicken, cooked pasta, and marinara sauce. Mix well to ensure the chicken and pasta are evenly coated.
3. Add the Cheese: Stir in half of the mozzarella cheese and all of the parmesan cheese into the chicken mixture. This adds richness and flavor.
4. Season the Mixture: In a small bowl, whisk the egg and add Italian seasoning, garlic powder, salt, and pepper. Mix this into the chicken and pasta mixture until fully combined.
5. Transfer to Casserole Dish: Pour the chicken mixture into a greased 9×13-inch baking dish, spreading it evenly.
6. Top with Cheese: Sprinkle the remaining mozzarella cheese evenly over the top of the casserole.
7. Bake: Place the casserole in the preheated oven and bake for 40-45 minutes or until the cheese is bubbly and golden brown.
8. Garnish and Serve: Once baked, remove from the oven and let it cool for a few minutes. Garnish with fresh basil if desired before serving.

These steps will guide you in creating this incredible casserole effortlessly, ensuring a delicious meal that everyone will love.