Preheat your oven to 400°F (200°C).
Using a meat mallet or rolling pin, gently pound the chicken breasts to about 1/2 inch thickness.
In three shallow bowls, set up your dredging stations: 1. Place the flour in the first bowl. 2. Beat the eggs in the second bowl. 3. In the third bowl, combine the bread crumbs, grated Parmesan cheese, garlic powder, and Italian seasoning.
Coat each piece of chicken in the flour, shake off excess, dip it into the beaten eggs, then press into the breadcrumb mixture.
Place the coated chicken pieces on a baking sheet lined with parchment paper. Bake for about 20 minutes, or until golden and cooked through.
Remove the chicken and spoon marinara sauce over each piece. Top with mozzarella slices and return to the oven for an additional 10 minutes.
Let the chicken rest for a few minutes, then serve hot with your favorite sides.