Soak the chicken in buttermilk and hot sauce for 1 to 12 hours in the fridge.
Mix the flour and spices. Lift each thigh out, let it drip, and press it into the flour on both sides.
Heat 1 inch of oil to 350°F (175°C) in a heavy pan. Fry the chicken 5 to 6 minutes a side until deep golden and 175°F inside. Drain on a rack and salt.
Fry the eggs in a little butter until the whites set.
Split the biscuits, spread herb mayo, add lettuce, chicken, egg and a spoon of tomato jam or a drizzle of honey.
Tips
A thermometer is the difference between greasy and crisp.
Pickles and honey with spiced oil makes it Nashville hot.