Most common questions used to investigate
Is your baking sheet very hot?
Is your butter very warm?
Did you measure the flower correctly?
Did you place your cookies on a high shelf in your oven?
Did you grease your baking sheet?
Did you use extra large eggs?
Common conclusions
A baking sheet that is too hot will cause your cookies to spread. Make sure your baking sheet is at room temperature.
Warm butter will cause your cookies to spread. Make sure your butter is cool.
If you didn't add enough flower, your cookies will often spread. Weighting your flower will help you measure accurately.
In gas ovens, higher shelves get hotter and make your cookies spread. Place your cookies on the middle shelf of your oven.
Greasing your baking sheets can make your cookies spread. Don't grease your baking sheet.
Adding more eggs than necessary will add liquid to your dough and can make your cookies spread. Don't use extra large eggs unless the recipe calls for them specifically.
Unfortunately, we were unable to determine why your cookies spread. Be sure to accurately follow the recipe, as this may often be the cause of the problem.
References
https://sallysbakingaddiction.com/tips-for-cookie-spreading/
https://www.thespruceeats.com/why-do-cookies-spread-when-baked-995121
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