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?
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.
Please do reuse the baking paper. It is non-biodegradable and non-recyclable because of the silicone so if you MUST use it, make it go several rounds for the sake of the environment. We always used to use butter paper (before it came in plastic containers) or plain unwaxed paper lunch wrap, greased if necessary. But for cookies, a greased tray works as well as baking paper, and buttering and flouring a tin does well for cakes. My mother lined her Christmas cake tin with several layers of greaseproof paper on the bottom and up the sides. And don’t forget that waxed lunch wrap is great for cheese, sandwiches and the top of jam jars. Jenny