Creating your own Chicken Parm Casserole is smooth sailing if you follow these detailed steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).

2. Prepare the Pasta: Cook rotini pasta according to package instructions until al dente. Drain and set aside.

3. Mix the Ingredients: In a large mixing bowl, combine the cooked pasta, shredded chicken, marinara sauce, 1 cup of mozzarella cheese, Parmesan cheese, Italian seasoning, garlic powder, salt, and pepper. Stir until everything is well mixed.

4. Transfer to Casserole Dish: Pour the mixture into a greased 9×13-inch casserole dish, spreading it evenly.

5. Top with Cheese: Sprinkle the remaining ½ cup of mozzarella cheese evenly over the top of the casserole.

6. Bake: Place the casserole in the preheated oven and bake for about 25-30 minutes, or until the cheese is melted and bubbly.

7. Broil for Golden Top: For an extra golden top, switch the oven to broil and cook for an additional 2-3 minutes. Keep a close eye to prevent burning.

8. Garnish: Once baked, remove from the oven and let it cool for a few minutes. Garnish with fresh basil leaves if desired.

9. Serve: Slice and serve warm, enjoying the delightful layers of flavor.

These simple steps will guide you in creating a delicious Chicken Parm Casserole that everyone will love.