1. Preheat the oven to 160℃/320℉. Line a parchment/butter paper in a 20x20 cm baking pan.
2. Cream butter, sugar, and salt till pale and smooth.
3. Sift in all-purpose flour and cocoa powder. Mix with a spatula till a crumbly dough is formed.
4. Put the cookie dough into the pan and with the help of a spatula press/compress the cookie dough. Smooth the surface of the cookie dough.
5. Score the dough in the preferred shape with a knife. Place some chocolate chips on top.
6. Bake at 160℃/320℉ for 25-30 minutes.
7. Cut through the score marks and let the cookies cool completely in the pan itself before consuming or storing.
