Ok so I bought some BowWownies from Clean Run to try out. They're basically the liver treats Glenda makes but comes in powder form and you reconstitute. The directions say to use an 11' by 17' pan to bake with. I don't have one that size! How thick should this stuff be spread so I know when to quit and use a new pan? I have 2 9x13's that I was going to use... but wasn't sure about thickness. It says if you use a smaller pan, to bake longer, but not sizes.