I'm open to an alternative ingredient that will make it hang together. Maybe a bit of flour given the moisture in the mash?
Dammit. Now I'm going to have to try this!
I'm thinking of making it quite thin, but yes, fry in skillet first for crisp and nice shape. Then... Hear me out... Freeze it, then top it, bake it.
@Vanitas - you lost me at egg