1 piece
In a bowl, mix together flour, baking powder, cocoa powder, and salt.
In another bowl, cream together the butter and sugar.
Add eggs and vanilla extract and mix well.
Add the dry ingredients to the butter mixture and combine evenly.
Wrap the dough in plastic wrap and chill in the refrigerator for 1 hour.
Shape the dough into small balls.
Roll the dough balls in powdered sugar.
Place the dough balls on a baking sheet and bake at 180°C (356°F) for 12-15 minutes.
Let them cool completely before serving.