Cook the pasta according to package instructions until al dente, then drain and set aside.
Preheat the oven to 400°F (200°C) and prepare a baking sheet.
While the pasta cooks, prepare the chicken by seasoning it with salt, pepper, and Italian seasoning, then coat in breadcrumbs.
Heat olive oil in a pan over medium heat and cook the breaded chicken for about 3-4 minutes per side until golden brown.
Transfer the seared chicken to the baking sheet and spread marinara sauce over each piece. Top generously with mozzarella and sprinkle with Parmesan cheese.
Bake in the preheated oven for 15-20 minutes or until the cheese is melted and bubbly.
In the pasta pot, combine the drained spaghetti with the remaining marinara sauce, adding reserved pasta water as needed to reach desired consistency.
Plate the pasta and top it with the baked chicken, spreading more marinara and extra cheese if desired.
Serve immediately, enjoying the combination of flavors and textures.