In a bowl, sift flour, cocoa powder, salt, and baking powder. Mix well using a wire whisk.
Add granulated and brown sugar. Mix well
Make a well in the center of the dry ingredients and pour the vegetable oil, eggs, vanilla extract, and coffee extract.
Using a rubber spatula. Stir, and mix until well incorporated or no traces of flour are left.
When you have formed a dough. Cover the bowl with cling wrap and chill in the refrigerator for 5 hours or overnight.
After chilling, preheat oven to 350°F or 180°C.
Rub a small amount of vegetable oil on your palm then roll dough into 2 inch-sized balls with your hands and coat thoroughly in powdered sugar.
Transfer to a baking pan with parchment paper and bake on 350°F/180°C for 16 minutes.
Remove from the oven and allow cookies to cool completely. Serve and enjoy. Bon appetit!