Heat the oven to 180°C / 350°F with the fan.
In a bowl, mix sugar, vanilla, oil, and eggs to a smooth batter.
In another bowl, mix all dry ingredients - flour, cocoa, baking soda, baking powder, and salt.
Add the dry ingredients to the first bowl with the batter.
Mix in the peanut butter chips.
On a baking pan lined with baking paper, place a quantity of a little less than a tablespoon of the batter in large intervals – the cookies spread while baking.
Bake for 10 minutes.
Cool at room temperature.
Have a cookie or two and enjoy!