So for my tot she likes quick, light, on-the-go, dry, simple snacks. Anything more elaborate always ends up being rejected.

Stuff like crackers she really enjoys for example. But I'm hoping other parents with picky eaters have stuff to throw in the pool of ideas? (She likes a few more stuff aside from crackers. The only "big" snack she'll eat occasionally is sweet pepper and cream cheese with everything seasoning. But that's usually a side thing for lunch)