Set oven for 190°C fan oven (200°C conventional)
Line a 20×20 cm baking tray with greaseproof or baking paper
Mix all the ingredients together in a large bowl or food processor until well combined
Press into the baking tray using the back of a wooden spoon
Cook for around 35-40 minutes until the flapjack starts to brown slightly on top
Allow to cool for 10 minutes and then transfer to a cooling rack to completely cool
Slice into bars and keep in an airtight container for 2-3 days or freeze
