Preheat oven to 250 degrees.

Using a mandoline, slice apples about 1/8 inch thick, discarding any seeds. Arrange on a parchment-lined baking sheet.

Sprinkle sugar and apple pie spice on top of the slices. Bake until dry, about 1 ½ hours, turning halfway through. Remove and transfer to wire racks to cool. Store in an airtight container.