In a large bowl combine the ingredients for the marinade; buttermilk, pickle brine, hot sauce, paprika, cayenne pepper, garlic powder and black pepper. Add in the chicken tenders, cover and marinate for at least 2 hours.
In a shallow bowl combine the ingredients to make the coating; flour, corn starch, paprika, salt, cayenne pepper, onion powder, garlic powder.
Remove the chicken tenders from the marinade and dredge each piece in the flour mixture and coat them evenly. Repeat the same with all the chicken pieces and set aside.
In a large deep pot heat oil on a medium flame to fry the chicken pieces. Once the oil is hot enough, slowly add the chicken pieces and fry for 5-6 minutes until the chicken is cooked through and the outer is crispy and golden.
Prepare the Nashville sauce by combining the mentioned ingredients; In a small bowl whisk hot oil (remaining oil from the chicken fried), brown sugar, cayenne pepper, paprika, garlic powder and salt.
Brush the prepared Nashville hot sauce over the fried chicken pieces or pour the sauce over the chicken and toss it until evenly coated.
Serve the Nashville chicken tenders with a touch of feta cheese on top and ranch as a dipping sauce.