Line a baking sheet with parchment or foil and set aside. Preheat the oven to 200 degrees. Wearing gloves, cut each jalapeño in half, remove seeds, and set aside.
In a medium bowl, mix the cheddar cheese, cream cheese, mayonnaise, bacon, pickled jalapeños, onion, plus half of the garlic salt and paprika. Stir well and set aside.
In a smaller bowl, mix together the panko breadcrumbs with the remaining garlic salt and paprika.
Spoon the cheese mixture into each jalapeño half, pressing it in firmly. Sprinkle the tops with the seasoned panko mixture.
Place 6–8 poppers in the air fryer basket, leaving about an inch of space between them. Cook at 380 degrees for 6–7 minutes.
Transfer the cooked poppers to the prepared baking sheet and place in the warm oven while you finish the remaining batches.