Hi there, it's difficult to offer advise without a bit more information about the recipe you were making and how much you reduced the sugar. It's possible adding more flour would make the cookies more crumbly. For more help troubleshooting, please consider contacting our Baker's Hotline. We're generally here M-F from 9am-9pm EST, and Saturday and Sunday from 9am-5pm EST, and are available via chat or by phone at 855-371-BAKE (2253). 

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