Preheat the Oven: Heat your oven to 375°F (190°C). Lightly grease a baking dish or line it with parchment paper.
Make the Filling: In a bowl, mix cream cheese, Parmesan, parsley, garlic powder, Italian seasoning, salt, and pepper until smooth.
Stuff the Chicken: Slice a pocket into each chicken breast without cutting through. Fill with the cream cheese mixture and secure with toothpicks.
Bread the Chicken: Dredge in flour, shaking off excess. Dip into beaten eggs, coating evenly. Press into a mixture of panko, Parmesan, and oregano.
Bake: Place in the baking dish, top with marinara sauce and mozzarella. Bake for 25–30 minutes until the chicken reaches 165°F (75°C) and the cheese is golden.
Serve: Remove toothpicks, garnish with basil and parsley.