Wash the Kale: Rinse the kale leaves thoroughly under cool running water to remove dirt or debris. Use curly kale or lacinato kale, depending on your preference.
Remove the Stems: Pat the leaves dry and remove the tough central stems. Tear the kale into bite-sized pieces, keeping them slightly larger than the desired chip size because they shrink as they cook.
Dry the Leaves Thoroughly: Place the kale in a salad spinner or spread it over a clean kitchen towel. Remove as much moisture as possible. Completely dry leaves are important for achieving a crispy texture.
Season the Kale: Transfer the leaves to a large mixing bowl. Drizzle with olive oil and sprinkle with garlic powder, smoked paprika, salt, and black pepper. Massage gently with your hands until the leaves are lightly coated without becoming soggy.
Preheat the Air Fryer: Preheat the air fryer to 300°F for about 2–3 minutes, if your model requires preheating. Make sure the basket is clean and dry before adding the kale.
Arrange the Leaves: Place a small batch of kale leaves in the air fryer basket in a loose, even layer. Avoid piling them on top of one another, as overcrowding can cause uneven cooking.
Air Fry Until Crispy: Cook at 300°F for 5–8 minutes, gently shaking the basket halfway through. Check frequently during the final minutes because kale can burn quickly. The leaves should look crisp and lightly toasted.
Cool and Serve: Remove the kale chips carefully and allow them to cool for a few minutes. They will become slightly crispier as they cool. Sprinkle with Parmesan cheese if desired and serve immediately.