Whisk together the oil and sugar in a large bowl (or use a stand mixer). Add in eggs and vanilla and whisk until well combined.
Whisk together flour, cocoa powder, baking powder and salt in a separate bowl. Slowly pour the flour mixture into the sugar mixture and stir until well combined. Chill the dough in the refrigerator for 15 to 30 minutes.
Preheat the oven to 350°F. Shape dough into 1 1/2 inch balls (I liked to use a medium cookie scoop). Place confectioners’ sugar in a small bowl and roll each cookie in the sugar.
Place cookies onto a baking sheet lined with parchment paper. Bake 8 to 10 minutes, or until the cookies are slightly crisp around the edges and soft in the middle. Allow to cool on the pan for 2 minutes, and then transfer to a cooling rack. Tip: If your cookies aren't cracking as much as you'd like, bang the pan on the stove right after they come out of the oven to crack the cookies.
To make spiced crinkle cookies, add a 1/2 teaspoon of cinnamon and a dash of cayenne.