Thoroughly dry the pickle slices on a paper towel to remove any excess juice. Leave them on the paper towels for at least 15 minutes. Press gently to release a bit more juice.
To set up your dredging station, mix together the flour, garlic powder, seasoned salt, and chili powder in a bowl. Beat the egg in another bowl. Add the breadcrumbs to a 3rd bowl.
Coat each pickle slice in the flour mixture, then the egg mixture, then the breadcrumbs and place it into the air fryer basket. Be sure to space the pickles apart so they aren't touching in the basket.
Spray the tops of the pickles with the cooking oil. This is what will make them crispy, so don't skip this step.
Cook at 375° F for 5 minutes. Turn them over and spray the tops again. Continue cooking for another 4-6 minutes, until crispy.
Notes
Be sure to dry the pickles before breading to make sure the breading stays on.
Use high-quality, thicker-cut pickles.
Pickles with ridges will hold the breading better.
If the pickles aren't browning, give them another spray of oil. Usually they don't brown because of lack of oil or too thick of batter.
If you don't want the pickles to be salty, give them a rinse before drying. If they aren't salty enough or lack flavor, give them a sprinkle of salt.
All air fryers have different wattage and may cook at different rates. You may need to adjust the time or temp for the best results.