Do you really need to use parchment paper for baking?

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Cookies.
Same batch, same oven, same amount of time.
The only difference?
I ran out of parchment paper in between rounds!

Also, did you know that you can reuse parchment paper? You totally can, with dry recipes like these cookies.
(Want to make these cookies? Here's the recipes for my favorite snickerdoodles ever)