Line a baking sheet with either parchment paper or a silicone baking mat.
In a bowl, combine the sugar, salt and cinnamon.
In a large bowl combine the egg white, and the vanilla extract. Add the pecan halves and toss to coat the pecans in the egg white mixture.
Sprinkle the sugar mixture overtop the pecans and toss again to coat.
Spread pecans in a single layer on the lined baking sheet.
Bake in preheated oven for 20 minutes. Stir and spread out again and bake for another 20 minutes. Remove from the oven and let cool completely before moving. Once completely cooled stir and break apart nut clusters.