We're glad you checked, Phyllis! The manufacturer does not recommend pre-heating this product empty because of the greater risk of thermal shock and breakage. It can, however, be used with a cold oven start or traditional pre-heated start to bake no-knead bread. Just be sure not to put more than 2 lbs of dough into the baker at once, or it won't be able to be covered and may even overflow the pan. Hope this helps! Mollie@KAF

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