Nairn's Belgian Chocolate Chunk Crunchy Oat Bars Nairn's Belgian Chocolate Chunk Crunchy Oat Bars are suitable for the whole family, and made with gluten free wholegrain jumbo oats. Super-versatile, these Crunchy Oat Bars cover lots of bases. They’re handy for a mid-morning snack or a healthy packed lunch, to have at your desk with a cuppa or a grab-and-go snack to keep in your bag for a busy day