01 - If the chicken breasts are thick, place them between sheets of plastic wrap and gently pound to an even thickness of about ½ inch using a meat mallet.
02 - In a large bowl, whisk together the buttermilk, egg, salt, black pepper, garlic powder, and paprika until well combined.
03 - Submerge the chicken breasts in the marinade, cover the bowl, and refrigerate for at least 30 minutes or up to 4 hours for best results.
04 - In a shallow dish, combine the flour, breadcrumbs, salt, smoked paprika, and cayenne pepper. Mix thoroughly to distribute the seasonings evenly.
05 - Remove each chicken breast from the marinade, allowing excess to drip off. Dredge in the flour-breadcrumb mixture, pressing firmly on all sides to ensure an even, adherent coating.
06 - Pour the vegetable oil into a large skillet or deep frying pan and heat over medium-high heat until shimmering and reaching 350°F.
07 - Carefully place the breaded chicken breasts into the hot oil and fry for 5 to 7 minutes per side until golden brown and crispy. The internal temperature should reach 165°F.
08 - Transfer the fried chicken to a paper towel-lined plate to drain excess oil. Allow to rest for 2 to 3 minutes before serving.