Preheat griddle to medium-high. Combine crawfish, cheese, sausage, green onion and Creole spice. Butter bread. Heap filling on unbuttered side of one bread slice, then spread it out evenly to corners. Cover with second bread slice, buttered-side up. Cook on griddle until first side is golden brown. Flip and cook until second side is golden brown and sandwich is hot all the way through. Remove and slice it up.
Combine all ingredients thoroughly.