Remove pie crust from freezer and allow to defrost for 20 minutes
Pre-bake the crust according to the directions on the package, taking it out just when it starts to turn golden brown. Remove from oven and allow to cool for 30 mins
In large bowl combine flour, baking powder, and salt and set aside
In the bowl of a stand mixer with the paddle attachment, combine sugar, cocoa, and oil until completely blended.
Beat in eggs, one at a time, until you can no longer see streaks from the eggs.
Gradually stir the dry ingredients into the cocoa mixture until thoroughly mixed. Be sure to only mix until just combined.
Cover dough and refrigerate for 2-4 hrs or overnight - the longer the better!
Preheat oven to 350 degrees
Gently press the cookie dough into the bottom of each baked pie crust, being careful not to crack the sides.
Bake in the oven at 350 degrees for 40-45 minutes. To get a soft doughy-like center, remove it a couple of minutes before it feels completely cooked. If you like a crisper cookie texture, allow it to cook longer.
Sprinkle with confectioner sugar