Wash and dry the jalapenos, then slice them into rounds, discarding the stems and seeds if desired for a milder flavor.
Set up a breading station with two shallow dishes. Place beaten egg in the first dish and breadcrumbs mixed with desired seasonings in the third dish.
Dip each jalapeno slice first into the beaten egg and then into the seasoned breadcrumbs, ensuring they are fully coated.
Preheat the air fryer to 375 degrees F (190°C) for a few minutes to ensure it's hot and ready for cooking.
Arrange the breaded jalapeno slices in a single layer in the air fryer basket, ensuring they are not overcrowded. Cook in batches if necessary.
Air-fry the jalapeno slices at 375 degrees F (190°C) for 6-8 minutes, flipping halfway through, or until golden brown and crispy.
Once the jalapeno slices are cooked to your desired crispiness, remove them from the air fryer and serve them immediately with your favorite dipping sauce, such as ranch dressing or sour cream.