KFC Improves Security Around Secret Recipe "HIGHLAND HEIGHTS, KY." (WNKU) - One of the best kept secrets in America is the blend of eleven herbs and spices Harlan Sanders used to create the recipe for Kentucky Fried Chicken. The handwritten copy of the formula is undergoing some security changes at corporate headquarters in Louisville. WNKU's Matt Kelley talked to spokesperson Lauri Schallow about how they're keeping the recipe a secret, and why they're making the changes. © Copyright 2009, WNKU