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 - Combine the granulated sugar and ground cinnamon in a small bowl, mixing thoroughly until evenly blended.
03 - Lightly brush both sides of each banana slice with the melted coconut oil using a pastry brush, ensuring even coverage.
04 - Sprinkle the cinnamon sugar mixture generously over both sides of the oiled banana slices, pressing gently to adhere.
05 - Place the seasoned banana slices in a single layer in the air fryer basket, working in batches if necessary to prevent overlapping for proper air circulation.
06 - Cook at 350°F for 10-15 minutes, flipping the chips halfway through the cooking time. Monitor closely during the final 3-4 minutes to prevent burning.
07 - Transfer the chips to a wire rack and allow them to cool completely. The chips will continue to crisp up as they reach room temperature.
08 - Optionally, sprinkle lightly with sea salt just before serving for a sweet and salty flavor contrast.