1. Cream the margarine with the white and brown sugar. Add vanilla essence and the egg, beating well.
2. Mix in sifted flour and salt. Add chocolate chips and chopped nuts.
3. Shape spoonfuls of mixture into balls and place on well-greased baking trays. Space evenly and allow room for spreading.
4. Bake at 180°C for 10 - 12 minutes. Remove from oven and allow to cool on wire rack. Store in an airtight container.