In reply to JaredCE:
Easily done. Making some protein flapjacks in between matches right now.
200g oats, 100g peanut butter, 2-4 tablespoons of honey, few scoops of protein powder, 50g died fruit of choice, couple of tablespoons of flax seeds. Melt the peanut butter, mix it all up, pop in a baking tray, gas mark 4 for 15-20mins.
Handy as shop bought ones can be they're costly and generally full of undesirables such as glycerol.
Of course as has been said a boiled egg or two is always an option, albeit a potentially bag/pocket stinker.