Place the egg whites in a bowl and gently whisk until smooth.
Line a baking tray with parchment paper.
Add erythritol and a small amount of salt to the egg whites and mix well.
Spread the mixed egg whites evenly over the tray.
Bake in a preheated oven at 170°C for 15 minutes.
Take out the baked egg whites, let them cool, and crumble them like streusel.