Toast the bread until crisp. Allow it to cool completely, then pulse in a food processor until fine crumbs.
Lay down a paper towel and pat the pickle slices completely dry (this helps them crisp).
In one bowl, whisk together the eggs.
In another bowl, combine the breadcrumbs, garlic powder, onion powder, and pepper.
Dip each pickle slice into the egg, then coat in the breadcrumb mixture, pressing gently to adhere.
Arrange in a single layer in the air fryer basket.
Lightly spray with olive oil spray. Air fry at 400 degrees F. for 4-6 minutes, flipping halfway, until golden and crispy.