Preheat oven to 250°F. Mix sugar, pumpkin pie spice and salt in small bowl. Beat egg white and vanilla in large bowl until foamy. Add pecans; toss to coat well. Add spice mixture; toss to coat pecans evenly.
Spread pecans in single layer on lightly greased baking sheet.
Bake 1 hour, stirring once. Cool slightly and break apart. Cool completely. Store in airtight container up to 2 weeks.