In Oz we have a plain biscuit known as an Arrowroot - a biscuit that is a common childhood denominator for many of us. It's up there with watching the ABC when you got home from school and dinking on your pushie (translation: giving a friend a ride on the front fork of your bike).
They are also extremely boring. They have no real taste. They are the biscuit equiv of water. They are marginally less flavourful than McDonald's cookies.
Consequently they get enhanced a lot. Typically if featuring in your lunchbox they had a smear of butter and were wrapped in gladwrap like a poor man's condom ("seriously baby, it won't come off, I added a rubber band and everything").
Recently I discovered something. Peanut butter on an arrowroot is good. It's in fact delish. Sure, it's likely not good for me but in my current sensitive stomach life I can digest it readily and it doesn't get stuck like toast does.
Anyway, Arrowroots and peanut butter - worth a try.