Preheat the oven to 225°F (107°C). Line two rimmed baking sheets with parchment paper.
Slice a small round off the bottom of the pear and discard. Using a mandoline or very sharp knife, slice the pear into ⅛-inch (3-mm) rounds. Remove any seeds from the slices.
Arrange the pear slices in a single layer on the baking sheets.
Bake the pear chips for 1 hour, then rotate the sheets and continue cooking until the pears have curled around the edges and appear dry, 45 to 60 minutes more. They will crisp more as they cool.
Notes
Slicing the pear--A mandoline will give you the thinnest, most even slices. If you have to cut them by hand it will still work, but you may end up with slightly thicker chips, which will take longer to bake.
Storage--Store them in an airtight container at room temperature for up to 1 week. They will soften over time as they absorb moisture.
Dietary--This recipe is suitable for gluten-free, dairy-free, and vegan diets.