Peel the nagaimo to remove the outer skin, then rinse and make slices of about 0.5 inch thickness.
Place the raw slices in a sealed plastic bag with the pepper and herbs and gently move the herbs around. Another method is to lay them flat on the air fryer surface and sprinkle the herbs evenly using half the quantities. When you turn the chips around, sprinkle the other half on the opposite side.
Bake for 15 minutes on 375 F, then open the air fryer's drawer and shake the fries to turn on the other side, or do it by hand if you kept the herbs aside for the opposite side.
Bake for another 5 to 7 minutes until slightly crispy. They should feel dry on the outside and still slightly moist and tender on the inside.
Serve immediately with dipping sauce or adding on top your favorite hot sauce (e.g. Sriracha on the photos for this recipe).