In a large bowl, combine ½ cup panko bread crumbs, Cajun seasoning, garlic powder, salt and pepper to make the crab cakes. Mix well.
In a separate bowl, combine the egg, mayonnaise, hot sauce, mustard, Worcestershire sauce, lemon juice, celery, shallot, serrano and parsley.
Pour the wet ingredients into the dry and mix with a fork. Add the crab meat and hand mix. Very gently form the mixture into 6 crab cakes. A rubber spatula is useful here.
Roll the crab cakes in the remaining ½ cup panko to coat each side and set them onto a large plate. Refrigerate a few minutes to firm them up, if desired.
Next, make the Cajun Cream Sauce by processing the mayonnaise, mustard, hot sauce, apple cider vinegar, pickled jalapenos, celery, Cajun seasoning, lemon juice and minced garlic in a food processor until smooth. Pour into a bowl and refrigerate until ready to use.
Heat a large pan to medium heat and add the butter. Add the crab cakes and cook them for 3 to 4 minutes per side, or until they are nicely browned on both sides. Serve with the Cajun Cream Sauce and lemon wedges.
