In a medium sized bowl, cream together your cocoa powder, sugar and vegetable oil until smooth
Add in your vanilla, and eggs one at a time, letting them combine fully before adding the next
Add the flour, baking powder and salt and mix until just combined. Scrape the bowl to ensure everything is mixed evenly.
Cover the dough with plastic wrap and chill for at least an hour to let the flavors develop or you can bake right away if you're impatient.
Scoop the dough onto a parchment paper-lined cookie sheet with a cookie scoop or a tablespoon. Dough will be sticky. (If your dough seems too soft and is unworkable, slowly work in up to 2 tablespoons of flour until desired consistency.)
When you're ready to bake, preheat your oven to 350ºF
Roll the dough into balls and then cover half with edible glitter.
Bake your cookies for 10 minutes. They will be soft when they first come out of the oven but will harden as they cool.