Wet ingredients. Whisk together 1/2 cup oil, 2 cups sugar in a large bowl (or use a stand mixer). Add in 4 eggs and 2 teaspoons vanilla and whisk until well combined.
Dry ingredients. Whisk together 2 cups flour, 1 cup cocoa powder, 2 teaspoons baking powder and 1/2 teaspoon 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 30 minutes (up to 24 hours).
Roll cookie balls in powdered sugar. 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.
Bake. Place cookies onto a baking sheet lined with parchment paper. Bake 8 to 10 minutes, or until the cookies look set and have started to crack. Allow to cool on the pan for 2 minutes, and then transfer to a cooling rack.
Notes
To make spiced crinkle cookies, add a 1/2 teaspoon of cinnamon and a dash of cayenne.