While lowering the oven temperature for this specific cookie recipe (know as a "formula," to test kitchen bakers,) helped control the spread, some other recipes may actually respond inversely and spread less when baked at hotter temperature. Baking temperature is just one of many factors that contribute to spread, so you may need to experiment with chilling, as well as baking time and temperature to achieve just the right amount of spreading and the final texture of your cookie. Kye@KAF

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