Do you have a dehydrator? My guys favorite home made treat is dehydrated sweet potato. Cut in thin strips, dehydrate. I use my oven - so 225 degrees for 3 hr. Temp and time will vary.
A close second is dehydrated chicken.
Homemade dehydrated things should be refrigerated when possible, and only last a couple of weeks, not forever like the ones with preservatives, though.