01 -
Stir together cocoa powder, oil, and sugar until you get a glossy dough with a dark look.
02 -
Crack in one egg at a time—beat for half a minute each. Toss in vanilla and mix well till smooth.
03 -
Stir together flour, salt, baking powder, and espresso powder. Gently mix this into the cocoa blend, stopping when just combined.
04 -
Wrap the dough tightly in plastic and stick it in the fridge for at least four hours, or even overnight if possible.
05 -
Scoop out dough into small 1-inch balls. Cover each one completely in powdered sugar. Place on a baking sheet lined with parchment.
06 -
Heat oven to 350°F and bake for 10 to 13 minutes. Allow to cool for a bit on the baking sheets, then move over to a rack to cool fully.