Use a mandoline set to 1/8-inch to thinly slice the pears. Remove the stem and seeds. Arrange the pears on a baking sheet in a single layer.
In a small bowl, combine the sugar and spices. Adjust to taste. Sprinkle over the pears.
Bake for 1 hour, turning once, or until the edges of the pears start to curl. Remove from the oven and let cool. (The pears will be slightly soft while they're warm but will crisp up once they cool off.)
