Preheat the oven to 160 degrees Celsius. Sift together the flour, cocoa powder, bicarbonate of soda, baking powder and salt. Set aside.

Beat the butter and sugar using an electric mixer till smooth and creamy and beat in the egg and vanilla essence. Add the flour mixture until almost blended. Mix in the chocolate chips

Scoop the dough onto a baking sheet, leaving enough space for spreading. Bake for 12 to 14 minutes.

Cool the cookies on a wire rack and store in an airtight container for five to seven days.