In a medium bowl, combine all-purpose flour, garlic powder, ground black pepper, and sea salt to form the seasoned flour mixture. Stir well until all dry ingredients are evenly blended.

Slice the fresh banana peppers in half lengthwise, removing the seeds for even cooking.

Dip each banana pepper half into the seasoned flour mixture, ensuring thorough coverage. Let them rest for about 5 minutes.

Preheat your air fryer to 350°F (175°C).

Arrange the coated banana pepper halves in a single layer in the air fryer basket, lightly spraying both sides with olive oil.

Air fry the banana peppers for about 8 minutes until golden brown and crispy.

Carefully remove them from the air fryer and let them cool on a paper towel-lined tray for about 5 minutes.