I believe it's rye, not corn. Corn is a New World grain and controversial for that reason.
Anyway, I know that that's the rule, and that all those risen cakes and breads are technically KP. But it is my opinion that the rule ill serves the stated goal of re-experiencing the deprivation and hardship of the exodus. If it's supposed to be a sacrifice, then I don't see the point of grinding up matzo to fashion it into luxurious, rich dessert breads. If you're doing that, IMHO, you might as well just use flour.
But as noted above, rabbis customarily consult Rashi, not Hanna.
