Here's a recipe I posted earlier in some thread about porridge oats that I found on the internet:-
1 cup brown sugar (could be replaced with maltodextrin, glucose or fructose
2 cups granola (Needs to be Lizzi's Granola from Tesco's or Sainsburys as it can be quite hard to find)
1 cup chopped nuts
1 cup mixed fruit (raisins, sultana's etc)
2 eggs
2 tsps of vannila essence
Mix the eggs, brown sugar and vannila esscense together, add the rest of the ingredients and mix well. Flatten it out into a baking tray about 12inch by 8 inch and cook for 25 minutes at gas mark 3. Allow to cool and cut into bars, usually 12. Then I wrap them into tinfoil and freeze. About a third never make the fridge there that good. I cannot remember now though if it was 260 calories a bar or 260grm carb a bar I worked it out to be roughly.
Usually I eat half a bar every 10 miles and have found that they are better than a shop bought for giving you that kick to get you going as they seem to get into the body very quick as I seem to be fit as a fiddle within a couple of minutes of feeding on one, probably psycological.
If you do a search on the internet there is lots of recipes, but that is the most simplest I have found.