Whisk together flour, cocoa, brown sugar, granulated sugar, instant coffee powder, baking powder, baking soda, and salt in a mixing bowl. Mix until well combined.
Add eggs, oil, and vanilla. Mix with your hands. At first, it will seem like there isn’t enough liquid and like the dough is dry and grainy. This is fine. Keep mixing until you see the mixture develop into dough.
Shape the dough into about 1 inch or 2.5 centimeters size balls.
Roll each ball well in the granulated sugar. Then, roll each ball very generously in powdered sugar.
Place the balls on a baking sheet lined with parchment paper. Add more powdered sugar on top.
Preheat the oven to 325°F or 160°C . Bake for 10 to 12 minutes. Remove from oven and let cool for 5 minutes before moving to a cooling rack.
