Pound chicken breast slightly for even thickness, if needed.
In a ziplock bag or bowl, combine buttermilk, white vinegar or lemon juice, kosher salt, and Holy Voodoo rub. Add chicken and marinate for at least 30 minutes in the fridge.
In a shallow bowl, mix flour, cornstarch, Holy Voodoo rub, paprika, garlic powder, and kosher salt.
Remove chicken from marinade and let excess drip off. Dredge chicken in flour mixture, pressing to ensure a thick, even coating.
Place chicken on a plate and let it rest 5–10 minutes to help the crust stick.
Heat ¼ to ½ inch of oil in a cast iron skillet over medium heat until it reaches about 350°F.
Carefully place chicken into the hot oil. Fry for about 6–8 minutes per side, flipping once, until golden brown and internal temperature reaches 165°F.
Transfer to a paper towel-lined plate to drain. Let rest for 5 minutes before serving.
Serve hot with dipping sauce or your favorite sides.