Set oven to 210 C / gas mark 7. Grease a baking tray
Sieve the flour into a mixing bowl
Cut the margarine into cubes and then rub into the flour using your fingertips. The mixture should then resemble breadcrumbs
Add the sugar and chocolate chips into the mixture. Mix using a wooden spoon
Break egg into a small bowl and beat with a fork. Add egg to mixing bowl and mix. Add 1 - 2 tbsp of water if the mixture does not stick together. The mixture must be firm enough to stand alone on the baking tray in lumps.
Place heaps of the mixture on the tray. Make sure that they are all an even size. Bake them for approximately 15 minutes, or until golden brown.