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Hi Kulia - 90% of the time cookies will become flat because the dough is too warm. The fat in the cookie (usually butter) is too soft and, therefore, begins to melt before the leavener has a chance to do its work. Popping the cookie dough in the fridge for a bit - you want it to be cool, but not cold - will solve this problem. If that doesn't work, another possibility is that your oven temperature is too low. This would cause the butter to melt before the structure of the cookie is set. This is easily fixed by confirming the temperature of your oven using an oven thermometer. Hope that helps! Best, Lynn C.
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Hi Kulia - 90% of the time cookies will become flat because the dough is too warm. The fat in the cookie (usually butter) is too soft and, therefore, begins to melt before the leavener has a chance to do its work. Popping the cookie dough in the fridge for a bit - you want it to be cool, but not cold - will solve this problem. If that doesn't work, another possibility is that your oven temperature is too low. This would cause the butter to melt before the structure of the cookie is set. This is easily fixed by confirming the temperature of your oven using an oven thermometer. Hope that helps! Best, Lynn C.