Bee, since your peanut M&Ms work, stick with them.
For myself, I can't handle the peanuts, but a little chocolate is good.
I like most granola bars, especially ones with some chocolate.
Trader Joe's dry-roasted and salted almonds -- LOVE em! Trader Joe's jumbo raisins (NOT regular raisins!) with pecans. Dates and pecans! Dried figs and pecans.
For breakfast, I have my own granola recipe that I make in a 5-gallon bucket. For backpacking, I add a little extra brown sugar, powdered milk and some coffee creamer. Just add warm water... it's good!
For dinners, I buy packages of Mtn House dinners for four, divide them into three parts, and that makes a dinner for me.
The friend I hiked with last summer is vegetarian. He bought veggie-hot dogs (canned, I think) and sliced and dehydrated them. They were crunchy--like dog food, but were quite tasty on the trail.
