A product available here in Canada is called "Fish Crisp". It is a dry coating, shake and bake sort of thing.
It is very good on crappie or most any other fish you care to cook. I try a lot of different methods for every other kind of fish, but Fish Crisp is about the only thing I like for crappies.
I know a lot of Americans buy it up here when they visit. Maybe it's available in the US now.
Good luck,
Glen