Heat oven to 275°F and line a rimmed baking sheet with parchment.
Whisk egg white and vanilla in a large bowl until foamy and light.
Toss almonds into the foamy mixture until every nut is lightly coated.
Stir sugars, cinnamon, salt, and nutmeg in a separate bowl until evenly mixed.
Sprinkle the cinnamon sugar over almonds and fold until no dry spots remain.
Spread almonds on the sheet in a single layer without crowding.
Bake 20 minutes, stir and spread again, then bake 18–22 minutes until dry and crisp.
Cool completely on the pan, break apart any clumps, and store airtight.