Whip the egg whites to a hard foam.
While still whipping add the sugar and vanilla sugar, continue until you have a shiny foam.
Add the blue color dye while whipping.
Add the almond flour, flour and salt and stir together to a cookie batter.
Start the oven at 180 degrees Celsius.
Place a baking paper on a baking sheet.
Roll small balls out of the batter and place on the baking paper.
Place in the oven for 10 minutes.
Take out and let the cookies cool down.