RUB the soft butter, coriander, salt, baking powder and flour into a crumb.
Add finely chopped onion and grated cheese. Use a spoon to mix everything thoroughly. Pour in the milk and continue to knead the dough. It turns out thick and sticky.
With wet hands, roll the dough into serving balls and flatten them with your hands.
Put on a baking sheet covered with baking paper and send to the oven for 15 minutes at 180 gr. focus on a dry wooden skewer. The size of cookies can be made different. I got 6 big things.