Preheat the oven to 180°C (356°F).
Cream the butter and sugar together in a bowl.
Add the egg and mix well.
Sift the cake flour, cocoa powder, baking powder, and salt together, then add to the dough and mix.
Add the chocolate chips and mix.
Scoop the dough by spoonfuls onto a baking sheet, leaving space between each.
Bake in the preheated oven at 180°C (356°F) for 12–15 minutes.