Elianna, I'll bet your batter wasn't thoroughly mixed. As you go along, the closer you get to the bottom of the bowl, the less mixed it is, the less flour it usually has, and the more the cookies will spread. I think that's what happened - not using a different pan. Always take a flexible bowl scraper and scraped the bowl completely clean, then mix for another 30 seconds or so. This ensures that all of the batter is thoroughly mixed.

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