Add the herbs and spices to a bowl and whisk to combine.
Add the sliced chicken to a bowl with the buttermilk and 3 Tbsp of the herbs and spices mix. Allow to marinate for 30 minutes up to 24 hours.
Add all the pepper mayonnaise ingredients in a bowl and combine. Adjust seasoning levels to taste.
Pour enough vegetable oil into a large-rimmed pan to fill it in half. Heat to 180℃ - 350℉
Dredge the chicken in plain flour and fry it in hot oil for 4-5 minutes or until golden and crispy. Set aside and repeat any remaining batches.
Warm the tortillas in a microwave or oven. Spread with pepper mayo, lettuce, tomato and chicken. Drizzle over more of the pepper mayo and fold. Dig in.