In a bow mix butter, sugar, brown sugar, salt, baking powder, baking soda, coffee powder and vanilla. Mix well.
Add milk and mix it until incorporated.
Sift in flour and cocoa and mix to form a firm and crumbly dough.
Preheat oven to 175 C.
Roll out portion of the dough to 1/8” thick and cut out cookies with a 2” cookie cutter. I used a 1 ¾” cutter.
Gently remove the cookies with a spatula and transfer to a greased baking tray. You can place cookies without any gap as it does not spread.
Bake the cookies for 10-12 minutes.
Remove on to a wire rack and let them cool completely. Finish off the remaining cookies.