01 - Place each chicken breast between two sheets of plastic wrap and use a meat mallet to pound to an even 1/2-inch thickness. This ensures uniform cooking and tenderness.
02 - In a mixing bowl, whisk together the buttermilk, 1 teaspoon kosher salt, and 1/2 teaspoon black pepper until the salt dissolves.
03 - Submerge the pounded chicken breasts in the buttermilk mixture. Cover and refrigerate for at least 30 minutes, or up to 4 hours for optimal tenderness. Overnight marination yields the juiciest results.
04 - In a separate wide bowl, combine the all-purpose flour, cornstarch, smoked paprika, garlic powder, cayenne pepper (if using), 1 teaspoon kosher salt, and 1/2 teaspoon black pepper. Whisk until evenly blended.
05 - Remove each chicken breast from the marinade, allowing excess buttermilk to drip off. Press each piece firmly into the seasoned flour mixture, coating both sides thoroughly. Shake off any loose coating.
06 - Pour vegetable oil into a large skillet or deep pan to a depth of about 1/2 inch. Heat over medium-high to 350°F. Use a kitchen thermometer to confirm the temperature for consistent results.
07 - Carefully lower the coated chicken breasts into the hot oil, working in batches to avoid overcrowding. Fry for 6 to 7 minutes per side until deep golden brown and the internal temperature reaches 165°F.
08 - Transfer the fried chicken to a paper-towel-lined plate and let rest for 2 to 3 minutes to allow juices to redistribute. Serve alongside mashed potatoes, coleslaw, or on a sandwich roll.