Peanut butter is my favourite MRE
http://www.ultralightbackpacker.com/moosegoo.htmlI've been experimenting with Moose Goo with great success. [and its related plumpy'nut] I prefer to use milk powder over corn flour. As far as I can tell, corn flour has the nutritional value of cardboard (before being vitamin fortified). Milk powder has an acceptable shelf life.
Moosegoo tastes great but is a bit thick when it is cold. I don't have a good solution for packaging yet. The refillable toothpaste tube works but only in warm temperatures.
I am trying to solve packaging issues using individual serving vacuum sealed bags. I have yet to figure out what bread/tortilla to put the Moosegoo on for best results since everything simply falls apart. Of course, the Moosegoo can be eaten directly.
Honey has pretty much infinite shelf life. Peanut butter about several years. Milk powder a year or two. Unrefrigerated, MooseGoo should have a the shelf-life should be on the order of a year or two. Not quite SOLAS/Coast Guard 5 year requirement but quite acceptable.