Sandy, the only issue is it takes longer for the ones in the center to be done, since they're SO far from the edge, compared to when they're in a 9" x `13" pan. Personally, I'd rather bake two 9" x 13" pans than one 18" x 13"; but yes, do try a shorter amount of baking next time, perhaps 35 minutes? Good luck - PJH

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