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When making bar cookies, create a liner for your baking pan by turning the pan upside-down and covering it with aluminum foil, making sure to form the corners and leaving an overhang of an inch or two. Then, remove the foil, turn the pan right side up, turn the foil over and place it inside the pan. It will make a perfect liner for your pan. If required by your recipe, grease the liner. Then continue baking your bar cookies as directed. Once baked, you can lift out the entire batch of bars and place it on a cooling rack to cool completely. You can then re-use your baking pan for another batch without having to wait for the previous batch to cool, and you won't have to wash the pan.