Hi Maureen! We generally advise against using any type of glass pan directly on top of a preheated baking steel. You really want to avoid sudden temperature changes to glass based pans as you run the risk of thermal shock...causing the glass to shatter. We would recommend using a metal pie plate if you want to bake directly on the steel. For glass pie pans, it's best to bake with them on their own rack in the oven and not on a steel or stone.

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