Pre-heat oven to 200oc Place butter and sugar in large bowl and mix well
add the egg and vanilla essence and mix again
sieve in flour and salt to mix and combine well.
Cut the chocolate, but not to finely and add. Mix together then roll balls of mixture to about 2cm by 2cm and place on a baking tray with baking parchment on. Be careful not to put the cookies too close together.
Place in preheated oven for 7-10 minutes. Repeat until all cookies are cooked.
I use different kinds of chocolate and add nuts. For double chocolate cookies simply replace 50g flour with 75g chocolate powder.