Mix cocoa powder, sugar, and vegetable oil until well combined. Beat in the eggs one at a time then the vanilla extract.
In another bowl, combine flour, baking powder and salt. Gradually add to the batter bowl and beat until blended. Cover the bowl with saran wrap to chill in the fridge for 3-4 hours.
Put the confectionery sugar in a platter or a ziploc bag.
Preheat the oven to 355°
Once chilled scoop the dough with a big spoon or a mini ice cream scooper. Using your hands, form a ball from the dough.
Do these until you have about 4 or 5 then roll em up in the confectionery sugar to coat. If using a ziploc bag, dump the balls in the bag, close then shake shake shake.
Place the cookie balls in a cookie sheet. Bake them in the oven for 10 minutes. Do this in batches.
