Start by slicing each chicken breast in half horizontally to create thinner cutlets. Season both sides with salt, pepper, garlic powder, dried basil, and oregano.
In a shallow bowl, combine the breadcrumbs and grated Parmesan cheese. Press each chicken cutlet into the mixture to coat thoroughly on all sides.
Bring a large pot of salted water to a boil. Cook the spaghetti according to package instructions until al dente. Drain and set aside, reserving about ½ cup pasta water.
Heat olive oil in a large skillet over medium heat. Cook the breaded chicken cutlets for 3-4 minutes per side until golden brown and cooked through. Remove and set aside.
Preheat oven to 375°F (190°C). Spread half of the marinara sauce in a baking dish or oven-safe skillet. Add cooked spaghetti, toss to coat with sauce. Place chicken over pasta and spoon remaining sauce over chicken.
Sprinkle shredded mozzarella over chicken and pasta. Bake for 15-20 minutes until cheese is melted and bubbly with golden spots.
Remove from oven, let cool for a few minutes. Garnish with fresh basil leaves. Serve hot and enjoy.