If you want chocolate meringue cookies, gently fold in 2 ounces of finely chopped bittersweet chocolate at the end of step 2. The meringues may be soft right after coming out of the oven, but they will stiffen as they cool. If it's humid or rainy, you can minimize stickiness by allowing the meringues to cool in a turned-off oven for an additional hour (total of 2 hours cooking) without opening the door and then transferring immediately to an airtight container to seal. These can be kept in an airtight container for up to 2 weeks. Cooking time is inactive.