Place chicken in a large zip-top plastic freezer bag. Add buttermilk; seal and chill 2 hours.
Remove chicken from buttermilk, discarding buttermilk. Sprinkle chicken with Creole seasoning and next 2 ingredients. Place flour on a large plate or in a shallow dish. Dredge chicken in flour, shaking off excess.
Melt shortening to depth of 11⁄2 inches in a Dutch oven or heavy-bottomed skillet at least 10 inches wide and 3 inches deep over medium-high heat; heat to 360°. Fry chicken, in batches, turning often, 15 to 20 minutes or until evenly browned and done. Drain on a wire rack over paper towels. Garnish, if desired.