1-Place chicken fillets between two sheets of: Place chicken fillets between two sheets of parchment paper and use a meat mallet to pound them to a uniform 1/2 inch thickness. Season both sides with salt and pepper.
2-In a medium bowl, whisk together mayonnaise,: In a medium bowl, whisk together mayonnaise, grated Parmesan cheese, panko breadcrumbs, garlic powder, smoked paprika, and dried oregano until a thick paste forms.
3-Using a spatula or hands, spread a: Using a spatula or hands, spread a generous layer of the Parmesan mixture over the top and sides of each chicken fillet, pressing firmly to adhere.
4-Place the coated chicken on a wire: Place the coated chicken on a wire cooling rack set over a rimmed baking sheet.
5-Bake at 400°F (200°C) for 20-25 minutes,: Bake at 400°F (200°C) for 20-25 minutes, or until the crust is deep golden mahogany and the internal temperature reaches 165°F (74°C).
6-Remove from the oven and let the: Remove from the oven and let the chicken rest for 5 minutes before serving to lock in juices.