I use these bars for energy (quick and slow release) when I have been doing a lot of running, swimming, biking.
They are easy to make and can be cut into bars and wrapeed for when needed.
Mix half a tub of peanut butter and Honey in a microvavable bowl.Heat for a minute.
Add plenty of oats, dried fruit nuts, choc chips etc. mix it all in so you get a thick and coarse mixture. in a baking tray, line the bottom with cling film. pour in mixture and flatten out with more clingfilm on top. put in fridge for 1-2 hours. take out and cut into rectangles. Individually wrap and take with you for when needed.
Also if you want more firm bars, add plain chocolate in with the honey and peanut butter before heating (it sets in rock hard) and if you wanted added protein, just add protein powder to the mixture!
Super cheap (20-30p a bar) and you decided what you want in it!