Flour mixed with baking powder and salt and set aside . Soft butter was stirred until it became creamy, add the two types of sugar and vanilla and mix until the products are mixed better. Add the whole egg mix, then add the egg yolk and is again broken. The flour was added to the oil mixture and stirred until a homogeneous mixture. Add chocolate chips and stir again to be distributed evenly. The dough is formed into sausage and brought up in foil and left in the refrigerator for 30 minutes. Then cut into wafers, flatten slightly by hand and bake in a preheated 180 C oven 10-12 minutes or until edges browned. Note that when removing from the oven after the required time, the biscuits are soft, this should not bother you, about an hour harden and become crispy.