One quick halakha before my ride to the airport gets here. This one comes from Shulhan Aruch O.C. 461:5:
Rough translation: Matzah baked with hametz is only problematic (i.e. considered hametz itself and thus prohibited on Pesach) if they touched, in which case, cut off from the matzah at the point of contact and the rest is fine. Lest you think this is some Sephardi leniency, here’s the Ramo:
And just to be sure, the Mishnah Berurah:
If you’d like to make sense of all this, I recommend looking over the entire siman as well as the Bet Yosef or you could hock your local Rabbi.
Hag Kasher V’Sameach!