In a medium mixing bowl, whisk together the mayonnaise, Creole mustard, and prepared horseradish until the base is smooth and well-combined.
Stir in the lemon juice, hot sauce, and Worcestershire sauce until fully incorporated into the emulsion.
Add the paprika, garlic powder, and cayenne pepper, whisking thoroughly to ensure no spice clumps remain.
Fold in the finely chopped green onions and fresh parsley using a spatula.
Transfer the sauce to an airtight container and refrigerate for at least one hour prior to serving to allow the flavors to meld.