In a medium bowl, mix together cocoa, white sugar, and vegetable oil. Beat in eggs one at a time, then stir in the vanilla.

Combine the flour, baking powder, and salt. Stir into the cocoa mixture.

Cover dough and chill for at least 4 hours.

Preheat oven to 350.

Line cookie sheets with parchment paper.

Roll dough into one inch balls. I like to use a number 50 size scoop.

Coat each ball in confectioners sugar before placing onto prepared cookie sheets.

Bake in preheated oven for 10-12 minutes. Let stand on the cookie sheet for a minute before transferring to wire racks to cool.