Start by boiling your penne pasta in a large pot of salted water until it is al dente. This ensures the pasta stays firm after baking. Meanwhile, if you’re not using pre-cooked chicken, heat olive oil in a skillet and cook your chicken breasts. Season with salt and pepper, and once fully cooked (165°F internal temperature), shred or chop the chicken.
Drain the cooked pasta and return it to the pot. Combine the pasta with shredded chicken, marinara sauce, and shredded mozzarella. Stir until the mixture is evenly coated, making sure every ingredient is well-mixed.
Grease a 9x13-inch baking dish. Spread half of your pasta mixture into the dish, then layer half of the fresh mozzarella slices on top. Add the remaining pasta mixture, spreading it out to cover the bottom layer. Finally, sprinkle the Panko-Parmesan mixture evenly as the crunchy topping and layer with the remaining mozzarella slices.
Bake the casserole in a preheated 450°F oven for about 15 minutes. For the best results, broil it for an additional 2-3 minutes to achieve a bubbling golden cheese topping.
Remove the casserole and sprinkle freshly sliced basil over the top. This not only adds flavor but also makes the dish look vibrant and inviting.