Preheat oven to 400 degrees Fahrenheit (200 degrees Celsius) and lightly coat a rimmed baking sheet with olive oil.
Organize three shallow containers for the breading station: flour seasoned with salt and pepper in the first; beaten eggs in the second; and Panko mixed with Parmesan, garlic powder, and oregano in the third.
Dredge each chicken breast in flour, dipping to coat and shaking off excess, then submerge in egg wash, and finally press firmly into the Panko-Parmesan mixture to ensure full coverage.
Arrange breaded chicken cutlets on the prepared baking sheet in a single layer.
Bake chicken for 15 minutes, then remove from oven.
Top each breast with 0.5 cup of marinara sauce and 0.375 cups of shredded mozzarella cheese.
Return the baking sheet to the oven and bake for an additional 10 minutes until the internal temperature of the chicken reaches 165 degrees Fahrenheit (74 degrees Celsius) and the cheese is melted and lightly browned.
Let the chicken rest for 5 minutes before serving to stabilize internal juices.