Girls step by step no photos (sorry) made them many many times and have always been different. Now I'll tell you the recipe and a few photos of my work.

Butter room temperature, mix with sugar and add eggs. The lumps will not get scared. In a separate bowl mix the flour + cocoa+ baking powder and add to first bowl. All gently stir. It turns out soft dough. No mixer-all with a fork. If you have a paper form then them two things take. I have a form of foil. The dough is spread on the floor of the molds. Because it is very well raised. In the oven at 180C for 30 minutes (check on a dry match). I did the same thing with meringue. The photo below