01 - If chicken breasts are thick, place them between sheets of plastic wrap and gently pound to an even thickness of about ⅝ inch using a meat mallet.
02 - In a large mixing bowl, whisk together buttermilk, egg, salt, black pepper, garlic powder, and paprika until well combined.
03 - Submerge chicken breasts in the marinade, cover tightly, and refrigerate for at least 30 minutes or up to 4 hours for deeper flavor penetration.
04 - In a shallow dish, combine flour, breadcrumbs, salt, smoked paprika, and cayenne pepper. Remove chicken from the marinade, allowing excess liquid to drip off.
05 - Dredge each marinated chicken breast in the flour-breadcrumb mixture, pressing firmly so the coating adheres evenly on all sides. Shake off any excess.
06 - Pour vegetable oil into a large skillet or frying pan to a depth of about ½ inch. Heat over medium-high heat until the oil shimmers and reaches 350°F.
07 - Carefully place coated chicken breasts in the hot oil. Fry for 5 to 7 minutes per side until golden brown and crispy, and the internal temperature reaches 165°F.
08 - Transfer fried chicken to a paper towel-lined plate to drain excess oil. Allow to rest for 2 to 3 minutes before serving to lock in juices.