Preheat the oven to 170C/350F
Line and grease a 20cm (8 inch) square cake tin. Ensure baking paper is high on 2 edges to assist in removing the slice.
Place all the ingredients into a kitchen processor and blend for 30 seconds.
Scrape down sides and pulse until a dough forms.
Place the dough into a cake tin and press to form an even layer (I used a shot glass as a mini rolling pin)
Bake in oven for 15 minutes or until golden brown.
Remove from the oven and allow to cool completely.