Preheat oven to 375F.
Whisk the egg whites, vanilla, stevia, and cinnamon (if using) together. Toss nuts/seeds in egg whites, making sure to fully and evenly coat all pieces.
Spread mixture onto baking sheet and bake for 90 minutes, removing to stir after 45 minutes.
The cereal will be sweet and crunchy- the longer you leave it in, the crunchier, but don’t forget about it or else they will become almost powdery!
Serve with fresh berries and almond milk! (or any milk of your choice!)