In a medium bowl, whisk together flour, baking powder, and salt.
In a separate large bowl, combine brown sugar, white sugar, cocoa powder and vegetable oil until well mixed. Add eggs one at a time, mixing after each addition. Stir in the vanilla extract.
Add the dry ingredients to the wet mixture and stir until just combined. The dough will be sticky. Cover the dough with plastic wrap and refrigerate overnight.
Preheat oven: Preheat the oven to 180°C and line a baking sheet with parchment paper.
Shape cookies: When handling sticky cookie dough, lightly oil your hands to prevent sticking it to the hands. You can use a little oil or butter:
Lightly coat your hands with a neutral oil like vegetable or canola oil. This prevents the dough from sticking to your hands.
You can also rub a small amount of softened butter on your hands for a similar effect. This adds a subtle buttery flavour to the dough.
Scoop out about 1 tablespoon of dough, roll it into a ball, and coat it generously in powdered sugar. Place the dough balls on the baking sheet, about 2 inches apart.
It is important to refrigerate the dough if you are baking in batches because it helps maintain the dough's consistency. As the dough sits at room temperature, it can soften, making it harder to work with and causing the cookies to spread too much during baking. Keeping the dough chilled between batches ensures that each set of cookies retains its shape and achieves that perfect crinkled look with a fudgy centre. So, always return the remaining dough to the fridge while baking in batches!
Bake: Bake for 10-12 minutes, or until the cookies have spread and the powdered sugar has created a cracked appearance.
Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
These cookies are perfect for the holidays or as a year-round chocolate fix!