Place the pickles on paper towels to absorb the excess liquid, then pat dry (so the chips don't come out soggy.)
In a medium bowl, combine the panko, cornmeal, Cajun seasoning, and parsley. Put the egg in a separate small bowl.
Working one at a time, coat a pickle chip in the egg, then in the crumb mixture, gently pressing to adhere. Set aside on a work suracee and reeat with the remaining pickles. Spray both sides of the pickles with oil.
Preheat the air fryer to 400 degrees.
Working in batches, arrange a single layer of hte chips in the air fryer basket. Cook for 8 minutes, flipping halfway, until golden and crisp. (For a toaster oven-style air fryer, cook at 375 degrees; the timing remains the same.)
Meanwhile, for the dressing: In a small bowl, whisk together the buttermilk, mayonnaise, scallion, Cajin seasoning, garlic powder, onion powder, dried parlsye, salt, and pepper to taste. Serve along side the pickles for dipping.