Lightly grease a baking dish to prevent sticking. Spread the shredded chicken evenly in the dish, then spoon the marinara sauce over the top.
Sprinkle red pepper flakes, Parmesan, and mozzarella cheese evenly over the chicken and sauce. Finish by adding crumbled bacon and dried basil for an extra burst of flavor.
Bake in the preheated oven for about 25 minutes, or until the cheese is melted and bubbling.
Remove from the oven and serve warm.
Notes
Feel free to adjust the cheese or seasonings to your taste. This casserole is perfect for a quick, healthy dinner.