Cut the slices about 2 cm (1 inch or so) thick.
Turning each slice over carefully, spray each side with cooking spray.
Using a flexible flipper (aka spatula aka fish slice), slide the flipper under each slice and arrange carefully in the basket of your air fryer. Do not stack. It's okay if they are close together, even if sides touch.
Air fry for about 10 minutes until the slices have browned and crisped a bit. Do not turn over during cooking.
If you are multiplying the quantities in the recipe, only do as many slices at one time as will fit in without stacking. Do in separate batches if you need to, keeping warm on a covered plate.