Combine oats and walnuts in medium bowl. Mix together honey, egg white, vanilla, cinnamon and salt in small bowl until well blended. Add honey mixture to oats; stir until well blended. Line 11×17-inch baking sheet with foil; spray with nonstick cooking spray. Spread oat mixture in even layer on prepared baking sheet. Bake at 325°F 15 to 17 minutes or until golden brown, tossing mixture 3 to 4 times during baking. Remove from oven. Cool completely until crisp and crunchy. Serve over yogurt and berries.