Rules state Baking Tray (Metal or Silicon) but would a Pizza stone be allowed to be used? Or if not it is a banned tool could one be inside a oven even if you used a separate tray for the cookies?

Is a purpose built pizza oven allowed either gas or electric or even wood fired ovens?

Eggs are pre-cracked commercially purchased eggs allowed is it just considered egg?

Also mayo is a common substitute for eggs could it be considered? As well as vegan No Egg in powder form where you need to mix with water or liquid form that comes packaged as a liquid?