Count your cookies: If you're using regular Oreos or another kind of sandwich cookie then you'll need about 25 cookies, but if you're using a smaller or larger type of cookie, adjust the amount accordingly.
Use parchment paper: Don't skip the parchment paper, otherwise your cookies might stick to the baking sheet and break when you try to remove them.
Check for doneness: The cookies are ready to come out of the oven when the middles are set and the edges are firm and slightly golden.
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