Whisk together the white sugar, brown sugar, salt and cinnamon. Set aside.
Mix the egg white with the vanilla extract in another bowl.
Put the pecans in the egg white and mix well with a spoon to coat all the pecans. Pour the pecans into the sugar mixture and mix until all the sugar has coated the nuts. Spread on a baking sheet covered with parchment paper.
Bake in preheated 300 degree oven for 40 to 45 minutes. Stirring well every 15 minutes. Remove from oven and let cool.
Notes
Store in airtight container for up to a month. You can double or triple the recipe or make as much as you like. This makes 3 cups.