Wash apples thoroughly and pat dry.
Peel, core, and slice into ¼-inch rings (or use an apple peeler/corer/slicer).
Cut spiral slices in half for more even drying.
Optional: Soak slices in lemon water for 5 minutes to reduce browning.
Arrange slices in a single layer on dehydrator trays or parchment-lined baking sheets.