Preheat the oven to 400°F (200°C) and lightly grease a baking dish with nonstick spray.
In a shallow dish, mix the bread crumbs, grated Parmesan, salt, oregano, dried basil, and black pepper until combined.
Beat the egg in a separate shallow dish to make an egg wash.
Dip each chicken breast into the beaten egg, coating both sides, then press into the breadcrumb mixture to fully coat.
Place the coated chicken breasts in the prepared baking dish and bake for 20 minutes.
Remove the dish from the oven and spread the pizza sauce evenly over each chicken piece.
Top each chicken breast with mozzarella and distribute the quartered pepperoni pieces over the cheese.
Return the baking dish to the oven and bake an additional 10 minutes, or until the cheese is melted and the chicken reaches 165°F (74°C).
Garnish with chopped fresh basil if desired, then serve.