Put the cream cheese, chicken, Cheddar, buttermilk, hot sauce, flour, Worcestershire, cayenne, garlic powder and onion powder in a slow cooker, and stir to roughly combine.
Cover, and cook on high for 2 hours; the mixture should be bubbling and the Cheddar melted. Stir until smooth and combined. Sprinkle with the parsley and blue cheese, reduce the heat to warm and serve with celery and carrot sticks.
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