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I just finished making cookies. The dough was enough to make multiple batches. I only have one baking sheet. Every time a batch was ready, I used new parchment paper on the baking sheet. Is this necessary or could I just re-use the same piece of paper till all my cookies are baked?

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Invest in the product silpat. Works wonders. – user26235 Jul 31 '14 at 15:31
@Linda Silicone baking mats are indeed great, though as Joe said, they do also insulate the bottom of the cookies and reduce browning and even sometimes change baking time. – Jefromi Jul 31 '14 at 17:00
up vote 26 down vote accepted

You can reuse parchment paper several times for your cookies (it also works for other dry dishes), depending on cooking time and temperature, with no problem. Change the paper when it gets dirty, dark and/or brittle as it may crumble beyond this point. I always do so with no difference in the results, saving both on money and waste.

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Additionally- you can use two sheets of parchment with one pan. Scoop dough onto one while the other is baking and then switch. – Sobachatina Mar 21 '12 at 14:56
When I bake multiple batches (I just got out of my 100-cookies-at-a-crack phase) I keep the same sheet of parchment paper on the sheet, remove the cooled cookies from it, throw more dough on the sheet and pop the tray back in the oven. I haven't noticed any issues with that system. – StevieP Mar 21 '12 at 16:33
@Sobachatina Cookie recipes often depend on the cookie sheet being cold when you put the cookies on. So you need to let the pan cool. – derobert Mar 21 '12 at 18:52
@derobert Very true, but I've made many a batch of choc. chip oatmeal cookies with hot pans, and usually decreasing cooking time 1-2 minutes is sufficient. – JYelton Mar 26 '12 at 17:30

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