In a bowl, add the cocoa powder, sugar, butter, oil and vanilla extract. Mix well to combine

Add each egg at a time and mix until everything is well incorporated

In a separate bowl, sieve the flour, baking powder and salt and mix to combine.

Fold in the flour mixture to the wet ingredients until a dough forms

Fold in the chocolate pieces or choc chip

Using a tablespoon, scoop some dough and form balls. Arrange the dough balls on an oven tray lined with parchment paper

Using the same spoon, lightly press down the middle of the dough balls to spread them.

Bake the cookies in a preheated oven for about 10-15 minutes at 190 degrees Celsius.

Remove the cookies and allow to cool before serving. The cookies will be soft but will harden once they cool.