Preheat oven to 180 degrees Celsius.
Sift plain flour, cocoa powder, baking powder and soda powder. Beat
butter and sugar until light and creamy. Add egg and beat until well
mixed. Add flour and stir until well mixed. Then add chocolate bits
and pecan nuts and knead to form a dough. Chill for about one hour.
Shape dough into 2 cm balls. Flatten out slightly with fingertips.
Place on baking tray which is greased, floured or lined with baking
paper. Bake for 20 minutes. Place biscuits on wire rack to let it