Preheat your oven to 250 degrees. Lightly spray a jelly roll pan with cooking spray. In a medium sized bowl, add the egg white and vanilla. Whisk together until frothy. Add the mixed nuts and stir until coated.
In a small bowl mix together the brown sugar and cinnamon. Add to the nuts and toss until coated. Spread the nuts evenly on your prepared pan.
Bake for 50-60 minutes in the oven and stir every 15 minutes until golden. Cool and then store in an airtight container.