In a medium bowl, combine all-purpose flour, garlic powder, black pepper, and sea salt. Mix thoroughly until evenly blended.

Carefully slice the banana peppers into rings, ensuring to remove any seeds if you prefer a milder flavor.

Toss the sliced banana peppers in the prepared seasoned flour until they are fully coated. Allow them to rest for 5 minutes.

Set your air fryer to preheat at 350°F (175°C) for about 5 minutes.

Place the coated banana pepper rings in a single layer within the air fryer basket and mist them lightly with olive oil spray.

Air fry the banana peppers at 350°F (175°C) for approximately 8 minutes.

Carefully transfer the crispy banana peppers to a paper towel-lined sheet to absorb any excess oil. Allow them to cool for about 5 minutes before serving.