Cut the chicken into eighths. Finely dice the onion and mince the herbs. In an air tight container, add the buttermilk, herbs, onion and chicken. Cover, refrigerate, let soak at least 8 hours. In a cast iron skillet, heat the oil to 350 degrees. In a bag, mix the flour and seasonings. Dredge the chicken in the flour mixture and fry in the oil.