Slice each chicken breast horizontally to create two thin cutlets.
Place the cutlets between plastic wrap and pound to 1/4-inch thickness.
Pat the cutlets dry with paper towels.
Set up three shallow dishes for breading station.
Mix flour, kosher salt, and 1/2 teaspoon pepper in the first dish.
Place beaten eggs in the second dish.
Combine panko, black pepper, oregano, garlic powder, and Parmesan in the third dish.
Dredge each cutlet in flour mixture, then egg, then press firmly into panko mixture.
Place breaded cutlets on a wire rack and rest for 15 minutes.
Heat 1/2 inch canola oil in a large skillet to 350F.
Fry two cutlets at a time for 3-5 minutes per side until golden brown and internal temperature reaches 165F.
Transfer to a clean wire rack and immediately sprinkle with flaky sea salt.
Let rest for 5 minutes before serving.