Preheat oven to 350 degrees and lightly grease a large baking pan.
Brush chicken on both sides with oil, then season with salt and pepper on both sides. Stir together breadcrumbs and parmesan cheese in a shallow dish and toss chicken in the breadcrumb mixture to coat on both sides. Arrange chicken on prepared baking dish.
Bake chicken for 15-20 minutes until cooked through and no longer pink in the middle. While chicken is cooking, combine marinara sauce, garlic, Italian seasoning, and basil in a medium sauce pan and stir over medium heat until hot throughout.
When chicken is cooked through, remove from oven and switch oven to broil. Top each chicken breasts with about ½ cup of marinara sauce and one slice of mozzarella cheese. Return to oven for 3-4 minutes until cheese is bubbly and starts to brown (keep a close eye on it so it doesn't burn).
Serve over cooked spaghetti noodles and top with cracked black pepper and fresh basil (optional).
** For extra crispy breading, spritz the chicken/breading with cooking spray a couple of times throughout baking or bake it on parchment paper and turn over once halfway through baking.
