Preheat the oven to 180°C and prepare the baking form with baking sheets.
In a bowl put all the dry ingredients and mix them well.
Now take the egg whites and beat them with a pinch of salt to whipped egg whites that it stays in the bowl also head over.
Add the sugar to the egg whites and beat till it gets shiny.
Add the dry ingredients into the egg whites slowly with a pastry scraper.
Now put the ready dough on the table and roll the pastry until 1 cm thick. Take a star cookie cutter, cut the stars and put on the baking sheet. It may take a little while if you are alone. And for sure you will fill more than one baking form.
Put the baking form in the oven and bake for around 30 minutes at 180°C.
When they get out of the oven they are very soft. Don't think there is something wrong you did. They will harden cooling out.
Now you can put some icing sugar on them. Or if you like dark chocolate. Or maybe an icing with color, some pink and green for Christmas?