Preheat your oven to 350˚F. This ensures that your Chicken Parmesan Casserole will bake evenly and become deliciously bubbly.
Prepare the penne pasta according to the package directions until it is al dente. You want it slightly firm, as it will continue cooking in the oven.
While the pasta cooks, chop the cooked breaded chicken into small bite-sized pieces. This makes it easy to mix and ensures every bite has a delicious chicken flavor.
In a large mixing bowl, combine the chopped chicken, marinara sauce, and parmesan cheese. Stir well until everything is evenly coated and mixed together.
Once the pasta is done cooking, drain it and add it to a large casserole dish (approximately 2.5 qt). Spread it evenly across the bottom.
Pour the chicken and sauce mixture over the pasta. Use a spatula to mix everything together, ensuring that the noodles are generously coated with sauce.
Top the casserole with mozzarella cheese, making sure to cover all of the pasta and chicken mixture. This will create that delightful melty top.
Bake in the preheated oven for about 15 minutes, or until the cheese is bubbly and slightly golden.
After 15 minutes, remove the casserole from the oven and sprinkle the Italian bread crumbs over the top. This will add a lovely crunch to your dish.
Return the casserole to the oven for another 5 minutes. For an extra crispy topping, you can broil it for an additional 1 to 3 minutes, watching closely to avoid burning.
Once it’s done, garnish the top with freshly chopped basil and serve hot. Enjoy this hearty and comforting meal!