Remove the chicken from brine and let them air dry.
In a bowl, combine the flour, cayenne pepper, salt, and pepper and thoroughly mix.
Pour the buttermilk into a separate bowl.
In a large pot, pour in the oil. (make sure there’s enough space left to prevent splash back), then heat the oil to 320 degrees Fahrenheit.
Piece by piece, coat the chicken with the flour mix, then dip it in the buttermilk, then once again coat the chicken with flour mix.
Place the chicken into the oil (you will need to fry in multiple batches), and fry them for 12 to 15 minutes.
Remove the fried chicken from the oil, and place them on a plate covered with paper towels to soak in excess oil. Add additional salt and pepper to the chicken immediately. Repeat the last three steps until all chicken is fried.