Preheat oven to 350 degrees Fahrenheit. Line two large cookie sheets with parchment paper. Set aside.

In the bowl of an electric stand mixer, mix the oil, sugar, flour, cocoa powder, eggs, vanilla, and baking powder, until soft dough forms.

Roll the dough into 18 balls slightly larger then golf balls.

Fill a small bowl with confectioners sugar and stir with a fork to break up any clumps. Lower the balls, one at a time, into the bowl of confectioners sugar and toss to coat heavily and completely. Transfer to prepared pans. Leave room between the dough balls, as the cookies spread during baking.

Bake for 18 minutes. If you like, you can make smaller cookies: form walnut-sized balls and bake for 12 minutes.

Cool completely.