Hi John, we have added some supplementary information on parchment paper use in the Tips From Our Bakers section of this recipe:  The maximum temperature rating for parchment paper is below 500°F, and at temperatures between 450°F and 500°F parchment’s exposed edges begin to char. To be safe, keep a close eye on anything being cooked at temperatures above 450°F (especially anything on an upper rack). Burned edges can also be minimized by trimming away excess parchment before baking. The type of parchment paper we sell is also rated to 450 degrees, but we've found it can be safely be used in the manner described above. 

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