Start by preheating your oven to 400°F and lining a large rimmed baking sheet with parchment paper. This temperature is perfect for creating a crispy exterior while cooking the chicken thoroughly. Set up your breading station with two shallow dishes - one for the egg mixture and another for the seasoned breadcrumbs.
Place each chicken breast between plastic wrap and gently pound to an even 1/4-inch thickness using a meat mallet or rolling pin. This ensures even cooking and tender results every time. Rub the flattened chicken with olive oil, Italian seasoning, salt, and pepper, making sure to coat both sides thoroughly.
If time allows, let the seasoned chicken marinate for at least 30 minutes, or up to overnight in the refrigerator. The longer marination time allows the seasonings to penetrate the meat, resulting in more flavorful cutlets. Even a quick 15-minute rest will improve the taste significantly.
In one shallow dish, whisk together the egg and milk until well combined, adding a pinch of salt and pepper. In another dish, mix the panko breadcrumbs, grated Parmesan, garlic powder, and smoked paprika until evenly distributed. The combination of these ingredients creates the perfect crispy coating.
Dip each seasoned chicken cutlet into the egg mixture, allowing excess to drip off. Then press the chicken firmly into the breadcrumb mixture, ensuring both sides are well coated. Press gently to help the coating adhere properly - this step is crucial for achieving maximum crispiness.
Place the breaded cutlets on the prepared baking sheet, leaving space between each piece. Spray the tops generously with cooking oil spray - this is what creates that golden, crispy surface. Bake for 15 minutes, then carefully flip each cutlet and bake for an additional 5-8 minutes until golden brown and the internal temperature reaches 165°F.