Mix together cocoa powder, espresso powder, sugar and oil in a medium bowl. Beat in eggs one at a time followed by vanilla.
Combine flour, bakin powder and salt in a separate bowl. Add to cocoa mixture and mix until thoroughly combined. Fold in chocolate chips.
Cover dough with plastic wrap and refrigerate at least 4 hours or overnight.
Preheat oven to 350 degrees. Line cookie sheet with parchment paper or a silicone baking mat.
Scoop a heaping tablespoon of dough (a medium cookie scoop is perfect!) and roll into a ball. Coat each ball in powdered sugar before placing on cookie sheet.
Baked for 10 to 12 minutes or until set. Let cool on cookie sheet for 3 to 5 minutes before removing to a wire rack to cool completely.