Cream margarine, sugar and condensed milk with an electric beater until light and creamy.
With a wooden spoon mix in flour and choc bits.
Then roll desert spoons of mixture into balls and place on baking tray and cook for 15 minutes until a light golden colour.
To freeze the mixture; roll mixture in a log, wrap in glad bake and freeze. To cook take from freezer and thaw before cutting into slices and cooking as above.