Which of the following is a key ingredient in the Nashville Hot Chicken?

The key ingredient in Nashville Hot Chicken is not sweet potato pancakes but rather the spice blend that is typically used in the preparation of Nashville Hot Chicken itself. This dish is characterized by its spicy, crispy fried chicken that is coated in a flavorful mix of cayenne pepper and other spices, giving it a distinct heat and flavor profile.

Sweet potato pancakes, while delicious, are not a traditional component of Nashville Hot Chicken and do not contribute to its signature flavor. The other options, such as mac and cheese and BBQ sauce, could be served as sides or accompaniments, but they do not represent an essential ingredient in the preparation of the chicken itself. Fried sage, while it could be a garnish or a flavor component, is also not a defining aspect of Nashville Hot Chicken. Understanding this context helps clarify how the actual spices used in the chicken are what truly make the dish unique.