Mix the butter, salt, cheese, water and egg yolk well together. Mix baking powder and flour and add. Combine to form a dough with a trowel or a spatula. Do not knead. Shape into rolls and chill for a few hours.
Cut the rolls into 5-7 mm thick slices and place on a baking sheet lined with baking paper. Bake in the oven preheated to 180 ° C for about 13 minutes (until they are nice and light brown).