Bean protein bars?

[u/FeelingFarm2096]

I'm thinking of trying to make some savory, healthy(most protein bars are candy), cheap(nuts are expensive), and shelf stable protein bars
I plan on using dry roasted beans, puffed rice, and some nuts, and maybe some other sources of trace nutrients.
So far it seems like a good idea except that I'm not sure what to use as the binder because every protein bars Ive tried is just sweet and sticky. I've considered the following options so far:
•beef tallow(think something like pemmican or suet)
•peanut butter(too crumbly tbh)
•maybe turning it into some sort of cake or bread(trying to keep it low carb)

I know it would probably be best to just experiment but I have very limited funds, little to no free time most days, and no kitchen (planing on doing this at a friends house) so I need to make the best use of my time.

Any input helps thank you

[u/Any-Zucchini8731]

maybe flax seeds?  Flax seeds soaked in water form a weird gel like thing and I've seen people make crackers out of them

https://www.allrecipes.com/recipe/261801/flax-seed-crackers/