I toast rolled oats as a base and melt low sugar dark cholate into it. Add dates and walnuts, or whatever dried fruit and nuts you like into it and spoon it out in bite size pieces to cool. You will have to keep it in a plastic bag because the cholate will be messy otherwise. I don't want to eat the chemicals and junk in most processed mixes or meat products.
A block of cheese is also a good high calorie source.
