Preheat oven to 175ºC fan, then line and grease a 20cm square baking tray
Remove from the heat and stir in the porridge oats and Cranberries and mix well
Tip the mixture into the baking tray and press down firmly with the back of a spoon
Bake for 15-20 mins until golden
Leave to cool for 5 mins then score into squares and run a knife round the edge of the baking tray to loosen
Once almost cold, turn out and cut through into squares
These flapjacks will keep fresh for a week if stored in an airtight container, or frozen for up to 3 months.