Oats are rich in vitamins, minerals, fibre and antioxidants and are considered one of the healthiest grains. Although flapjacks are rich in oats, they also contain large amounts of butter, syrup and sugar. It's possible to make flapjack healthier by adding fruit and nuts and using agave syrup or honey instead of golden syrup. However, reducing the sugar content can mean that the flapjacks will not bind together as well.