Put the softened butter in the bowl of a mixer and cream with the sugar. I used a food processor to cream my butter and sugar.
Add the egg to the processor or mixing bowl, and mix well. Add the sifted dry ingredients and the salt and process until the mixture comes together in a ball. Do not over mix
Add the chips if using
Flatten out into a disc and refrigerate till chilled.
When ready take out of the fridge and roll to between two pieces of baking paper to a thickness of 3mm. Rolling and cutting the dough will be a little like rolling pastry. The flour you use will stay on the baked biscuits if you use a lot. Brush off excess with a pastry brush. Using baking paper will make the dough nice and smooth and you wont have to use as much flour to stop it sticking ( you can use Icing or confectioners sugar to stop the sticking too) Use your cutter to cut out shapes. Put onto a lined tray and bake for 7-10 minutes or until firm.