Preheat the oven to 180°C (356°F).
In a bowl, cream together the butter and sugar until smooth.
Add the egg and mix well.
Sift in the cake flour, cocoa powder, baking powder, and salt.
Once the dough comes together, shape it into little dog poop shapes by hand.
Place the shaped dough onto a baking tray.
Bake in the preheated oven for 12 to 15 minutes.
Let cool completely before serving.