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Baking Perfect Cookies

By Cook's Illustrated Published January 2011

DON'T FORGET TO PREHEAT: To keep cookies from spreading too much, it is important to expose them to an immediate blast of heat. It takes at least 15 minutes for a standard oven to reach the desired temperature.

USE AN OVEN THERMOMETER: Oven temperatures can be off by as much as 50 degrees. Always use an oven thermometer to tell you what’s really going on inside.