Flapjacks are one of the most deceptive "healthy" foods ever - all that fat!
My favourite snacks are hard to define as I tend to eat little but often as opposed to square meals. Therefore almost every meal I have is kind of a snack. However I am very fond of apples, pots of yoghurt, toast, and (it had to come..) the dreaded chocolate.
Fortunately for me, my favourite crisps - Squares - are relatively low in fat, so the bag or so I eat per day isn't a major impact on my health.