Preheat oven to 250°F (120°C). Lightly grease a 10x15-inch jellyroll pan or a large cookie sheet.
In a large bowl, lightly beat the egg white. Add the vanilla extract and continue to beat until the mixture is frothy but not stiff.
Add the whole almonds to the bowl and stir until they are well coated with the egg mixture.In a separate small bowl, mix together the granulated sugar, light brown sugar, cinnamon, and salt.
Sprinkle the sugar mixture over the almonds, tossing to ensure they are evenly coated. Then, spread the almonds in a single layer on the prepared jellyroll pan.
Place the pan in the preheated oven and bake, stirring occasionally, for about 1 hour or until the almonds are golden brown and no longer wet.
Once baked, allow the almonds to cool completely. Store them in an airtight container to keep them fresh.
Note : Store in airtight container for 2-3 weeks at room temperature. They can be refrigerated to extend freshness for up to a month.