Mix all of the ingredients in a bowl to form a homogeneous mass. Spread the mixture as thinly as possible on a baking tray lined with baking paper.
Bake for approx. 25 mins. in the centre of an oven preheated to 150°C. Stir the mixture approx. every 10 mins. to ensure an even brown colour.
Allow to cool completely, then break into pieces/clusters.