Preheat the oven to 180oC/350oF/Gas
4. Lightly grease two large baking sheets. With an electric mixer, cream
the butter or margarine and both the sugars together until light and
fluffy.
In another bowl, mix the egg and the
vanilla essence, then gradually beat into the butter mixture.
Sift over the flour, bicarbonate of
soda and salt and stir.
Add the chocolate chips and walnuts,
and mix to combine well.
Place heaped teaspoonful of the dough
5 cm apart on the baking sheets. Bake in the oven until lightly colored,
about 10-15 minutes.