[Qingdai]

Yes, you can cut parchment to any shape you like just don't let it over hang.

I don't know liv, I made cookies. They ended up all strange and mushy, they feel apart, if I recall correctly. The same recipes worked fine on parchment paper. It was a basic sugar cookie holiday recipe and a ginger bread cookie. Perhaps it insulated the cookies from the heat in some way that changed the consistency.