Again, I'm new with PC and though I love the stones I haven't been using them long. I have a customer who bought the medium pizza stone (her first stone). She tried making a fruit pizza on it but when she cooked the cookie she said it spilled all over her oven. I have never made this recipe before so am wondering...what could she be doing wrong? Is this normal for a cookie to spread so much it goes over the edge of the stone...granted this is a large cookie she is making, but anyway...any suggestions?? I don't want her to be turned off from the stoneware so I thought if I could solve her problem she might be more likely to keep trying! HELP!