I am making a cake on Tuesday. The recipe us for 2 9" rounds. I want to make a 9x13 but I want 3 layers because of the super yummy filling. Should I triple the recipe and just bake in 3 pans? The woman who posted the recipe said she made it in a 9x13 and it was a pretty thin layer. Also, I am going to bake in glass pyrex dish, does this change temp or cook time? Any input would be so helpful. Thanks.