Preheat oven to 220°C/425ºF/Gas 7.
Pour one cup of tomato sauce into a 9”x13” baking dish and spread into an even layer across the bottom. Set aside.
Place chicken breasts between two sheets of plastic wrap and pound with a meat mallet or rolling pin until approximately ½” (1cm) thick. Remove and discard the top sheet of plastic wrap. Season the chicken with salt and black pepper, as desired, and set aside.
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Pour the flour onto a shallow, rimmed plate. Set aside.
Whisk the eggs and water together in a large, wide bowl. Set aside.
Place the breadcrumbs, Italian seasoning, and one-quarter cup of Parmesan cheese and season with salt and pepper as desired. Mix together with a fork to combine and set it aside.
To add breading to each chicken breast, lightly dredge the breast in the flour, shake off any excess.
Dip the floured chicken into the egg wash to coat completely and gently shake off any excess egg.
Press the floured and egged breast into the bread crumb mixture until thoroughly coated on both sides. Once coated, place each breast onto a large plate and set it aside. Repeat until all chicken breasts are breaded.
Heat one tablespoon of olive oil in a large, high-sided pan over medium heat. Once hot, add half the chicken breasts to the pan and cook until lightly browned on each side, approximately 4-5 minutes per side. Once browned, transfer the breasts to the prepared baking dish and arrange them in a single layer. Repeat this process with the remaining olive oil and chicken.
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Top the browned chicken breasts with the sliced Mozzarella and spread the remaining tomato sauce across the top in an even layer.
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Sprinkle the remaining grated Parmesan cheese on top and place the baking dish into the center of the preheated oven. Bake for 15-20 minutes, or until the chicken is cooked through.
While the chicken is baking, prepare the spaghetti according to package directions. Drain and set aside until ready to serve.
Remove the baking dish from the oven and cool for several minutes. Divide the spaghetti among individual serving plates and top each serving with a cheesy chicken breast and some sauce.
To serve, sprinkle some fresh basil and/or Parmesan cheese on top if desired. Enjoy!