Hi Amy- Next time you drive by a big box home improvement store- stop in and go to the tile section. Pre-measure your oven racks, and you'll find a wide array of un-glazed floor tiles you can arrange to completely cover the rack. Works like a charm- buy a few extras as they will crack, but at a dollar or two apiece, who cares? (Easier to store than a big pizza stone, too, tho as someone else pointed out here- they can be left in the oven full time- they make a great heat sink.)

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