In the bowl of the combine, with the nozzle “knives”, sift flour (flour may need a little more or less, so it’s better to add 200 g, and the rest of the amount to postpone) and soda.
Add salt and sugar (it is better to use fine granulated sugar or replace it with powdered sugar).
Cut the cold butter into cubes and add it to the bowl too.
You can also do everything manually, just rub all the components with your hands until flour crumbs form.