I make my own trail mix up in a big tupperware container (it seems to keep pretty well for ages in the cupboard). I like eating it and it seems to work, especially for longer rides (6 or 7 hours). A bit like a healthier pick and mix if you will; may contain the following: dried (but moist) apricots, figs, salted peanuts, honey roast cashew nuts, pine nuts, sesame seeds, dried cranberries, raisans and, most importantly, chocolate M&Ms to give it all some colour (and because I like chocolate). It looks a bit wrong on a warm day when the colour leeches from the M&Ms but it tastes divine, sweet and savory, big bits and little bits. Always tend to eat more than I probably need!!
The above receipe for cheesey oatcakey things looks good mind you, I’ll be trying that when I get home.