01 - Peel the bananas and cut them into thin, even slices about 1/8 inch thick using a sharp knife or mandoline for uniformity.
02 - In a small bowl, mix together the granulated sugar and ground cinnamon until thoroughly combined.
03 - Brush the banana slices lightly with melted coconut oil on both sides, then sprinkle the cinnamon sugar mixture evenly over both sides of each slice.
04 - Place the coated slices in a single layer in the air fryer basket, working in batches if necessary to ensure no overlapping for proper air circulation.
05 - Cook at 350°F for 10-15 minutes, flipping the chips halfway through the cooking time. Monitor closely during the final minutes to prevent burning.
06 - Remove from the air fryer and transfer to a wire rack to cool completely. The chips will achieve optimal crispiness as they cool. Optionally sprinkle with sea salt before serving.