In my oven it took 17 minutes to bake it is not the same for all the ovens.
It seems they add ammonia instead of baking powder/soda!but I have added baking soda instead.
When using hand blender the flour will fly all over so use the hands first to mix and then the hand mixer.
The dough will be sticky so be patient and pat with hand itself to flatten it and use a rolling pin to even out the sheet.