In a bowl combine the cocoa powder, flour, baking powder, cinnamon and salt.
In another bowl combine the oil, eggs, vanilla, sugar and whisk together well. Then combine both mixtures together and stir well then chill for 15 minutes
Prepare a baking sheet with a piece of parchment paper. Place the powdered sugar in a small bowl. Once the dough has chilled spoon about 1-2 Tablespoons into your hands and form into a ball and coat it with the powdered sugar and continue the same procedure for the remaining dough.
Bake for 15 minutes and allow to cool for an hour. These cookies are best cooled or room temperature.