01 - Place each chicken breast between two sheets of plastic wrap. Using a meat mallet, pound to an even thickness of approximately 1/2 inch for uniform cooking.
02 - In a shallow bowl, whisk together buttermilk, salt, black pepper, paprika, and garlic powder until well combined. Add chicken breasts and turn to coat thoroughly. Marinate for at least 15 minutes, up to 2 hours for enhanced flavor penetration.
03 - Arrange three shallow bowls in sequence: first with flour, second with beaten eggs mixed with Dijon mustard, third with panko breadcrumbs, Parmesan cheese, and dried oregano combined.
04 - Remove chicken from marinade, allowing excess liquid to drip off. Coat each breast in flour, shaking off excess. Dip into egg mixture, then press firmly into panko-Parmesan mixture to ensure complete adherence.
05 - Heat oil in a large skillet over medium-high heat until temperature reaches 350°F. Add chicken breasts in batches without overcrowding. Fry for 3-4 minutes per side until golden brown and internal temperature reaches 165°F.
06 - Transfer cooked chicken to a paper towel-lined plate to drain excess oil. Let rest for 2 minutes before serving to allow juices to redistribute.