Set your oven to 400°F (200°C) and allow it to fully preheat. Prepare a sturdy baking sheet by lining it with parchment paper. This step helps prevent the chicken from sticking and promotes even heat distribution, ensuring the chicken cooks uniformly without burning or drying out during the baking process.

Thoroughly pat the chicken breasts dry using paper towels to remove excess moisture. This ensures the breadcrumbs stick effectively, resulting in a crispy, golden-brown crust. Proper drying is essential to achieve the desired texture and prevent sogginess during baking. Make sure no moisture remains on the surface before proceeding.

In a shallow dish, thoroughly combine the panko breadcrumbs, parmesan cheese, salt, and black pepper. Stir the mixture until the ingredients are evenly distributed, ensuring the breadcrumbs are well-coated with the cheese and seasonings. This will create a uniform coating for the chicken, enhancing the texture and flavor profile.

Begin by dipping each chicken breast into the olive oil, ensuring it is completely covered. Next, roll the chicken in the breadcrumb mixture, pressing down gently to make sure the coating adheres well. This step is crucial for achieving a crispy texture. Check that the breadcrumbs are evenly distributed and firmly attached before proceeding.

Arrange the coated chicken breasts evenly on the prepared baking sheet, ensuring they do not touch. Bake in the preheated oven at 400°F for 15 minutes. During this time, the breadcrumbs should turn a golden brown, and the chicken should be partially cooked through, with juices running clear.

Carefully take the pan out of the oven and gently spoon the tomato sauce over each chicken breast, ensuring an even layer. The sauce should cover the top of the chicken without soaking into the panko breadcrumbs, preserving their crisp texture. This step adds moisture and flavor to the dish.

Distribute the mozzarella cheese evenly across the tomato sauce layer, ensuring full coverage. Place the pan back into the preheated oven and continue baking for another 10 minutes. During this time, the cheese should melt completely, becoming golden and bubbly. Check that the cheese has reached a desirable texture before removing from the oven.

Use a meat thermometer to verify the chicken's internal temperature. Insert it into the thickest part of the chicken breasts, ensuring it reaches 165°F (74°C). This temperature confirms the chicken is fully cooked and safe to eat, preventing any risk of undercooked poultry.

To achieve a golden, crisp finish, adjust the oven setting to broil for 2-3 minutes. Keep a vigilant eye on the chicken during this time, as the cheese can transition from perfectly browned to burnt rapidly. The broiling process should enhance the texture and appearance without compromising the dish's overall quality.

Once the chicken is fully cooked and golden brown, take it out of the oven. Allow it to rest on the counter for about five minutes to let the juices redistribute. Just before serving, sprinkle fresh basil leaves over the top to enhance the dish's visual appeal and aroma.