Wash and core the apples. Peel them if desired.

Slice the apples into 1⁄4 inch rounds or smaller pieces.

Optional: Soak apple slices in lemon water to prevent browning.

Arrange slices on dehydrator trays in a single layer, or on oven racks.

Dehydrate at 135°F until slices are dry and brittle, 6-12 hours.

Allow slices to cool completely.

Transfer slices to a blender. Pulse into a fine powder.

Store powder in an airtight container for up to 1 year.