The Colonel's Secret Recipe for Kentucky Fried Chicken

I don't know. The Chicago Tribune reported that, after using the recipe given to them by Colonel Sander's nephew, MSG had to be added in order to recreate KFC's taste. The Tribune article is paywalled, but from Wikipedia:

After some trial and error, they decided the chicken should be soaked in buttermilk and coated once in the breading mixture, then fried in oil at 350 °F (177 °C) in a pressure fryer until golden brown. As a pressure fryer was too big, a deep fryer was used alternatively as a substitute. They also claimed that, with the addition of MSG as a flavor enhancer, they could produce fried chicken which tasted "indistinguishable" from fried chicken that they had purchased at KFC.