Preheat oven to 250 degrees F. Spray baking sheet with cooking oil.
Lightly beat the egg white with water until frothy.
Add cashews, then stir until well coated.
Mix together the sugar, salt, and cinnamon, and sprinkle over the coated cashews.
Toss to coat, and spread evenly on the prepared pan.
Bake for about 45 minutes, stirring every 15 minutes, until golden.
Allow cashews to cool, then store nuts in a Ziploc bag or other airtight container.
Enjoy!