01 - Wash apples thoroughly and remove cores. Slice crosswise into thin rounds approximately 1/8 inch thick using a mandoline slicer or sharp knife.
02 - Pat apple slices dry with paper towels to eliminate surface moisture, ensuring better crisping results.
03 - Place apple slices in a single layer in the air fryer basket without overlapping. Prepare in batches if necessary to maintain proper air circulation.
04 - Lightly spray or brush slices with oil if desired. Dust evenly with ground cinnamon and optional sugar coating.
05 - Cook at 325°F for 12 to 15 minutes, flipping all slices after 7 minutes. Watch closely during final minutes to prevent over-browning.
06 - Transfer golden, crisp chips to a wire rack for cooling. Chips will continue to crisp as they cool. Store in an airtight container for up to 5 days.