Preheat the oven to 375°F (190°C). Line a baking sheet with parchment paper. Whisk egg white, sugar & cinnamon in medium bowl. Add walnuts & stir to coat. Spread nut mixture on baking sheet. Cook for 20 minutes or until golden brown. Let stand until cool, mixture will become crisp as it cools. Coarsely chop cooled mixture.