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A vast array of cookie recipes spring from one basic formula: butter and sugar are beaten together, eggs are stirred in for moisture, and flour is mixed in at the end. The consistency of the resulting cookie dough can range from one firm enough to roll out and cut, to a dough soft enough to drop from a spoon right onto a baking sheet, to a very wet dough moistened only with egg whites that has to be piped and thinly spread with a knife onto a baking sheet. (A charming cookie called a langue de chat, or cat’s tongue, is made from this last kind of dough.) Beating butter and sugar together until fluffy and light-colored is called creaming. Sugar is added, and the beating continues until the mixture is light and fluffy again. The creaming process aerates the butter: air bubbles are literally forced into the butter mixture. These air bubbles expand during the baking, making the cookies light and tender. Butter can be creamed by hand or with a mixer. If using a mixer, the butter and sugar can be added at the same time. Mix at medium-high speed for 2 or 3 minutes (if using a stand mixer, use the paddle attachment). Stop the machine once or twice to scrape down the sides to ensure that all the sugar gets incorporated into the butter evenly. In a pinch, cold butter can be used: just put it in the mixing bowl by itself and beat until soft before adding the sugar. The butter has to be soft to cream properly. Once the butter and sugar are creamed together, add the eggs and mix well. If using a mixer, scrape down the sides of the bowl as needed. It is important that the eggs be at room temperature, too. If they are added cold, the butter will seize up, deflating the air bubbles, and the dough will resist thorough mixing. Add liquid flavorings and sweeteners such as vanilla extract, liquors, molasses, and honey along with the eggs. Flour is the last ingredient to be added. Be sure to measure the flour the same way every time. This will make your baking more consistent. I recommend this method: Stir the flour up to fluff it. Use a dry measuring cup, the flat-topped kind that fills to the brim, and either scoop up the flour with it or spoon the flour into it; then draw a spatula or knife across the top of the cup to level the flour. Don’t tap the cup or the flour will compact. Add the flour to the butter and eggs and stir it in until just mixed. You want all the flour to be completely mixed in, but too much stirring will activate the gluten in the flour and make the cookies tough. Mix salt, ground spices, and baking powder or baking soda into the flour before it is added to the cookie dough. Chunky flavorings such as chopped nuts, chocolate, or dried fruit should be stirred in gently after the flour has been mixed in. Dough for drop cookies can be baked right away or chilled and baked later. Cookies that are to be shaped or rolled out often require chilling first to firm up the dough. Many cookie doughs can be rolled into logs, chilled, and then sliced into neat cookies to bake. Shape the logs into ovals, squares, or rectangles for different shapes. The logs can be frozen for up to 2 months and the sliced cookies require no defrosting before baking. Slice off as many cookies as needed and return the rest to the freezer for later. To bake cookies properly it is worth investing in one or two heavy baking sheets. They help the cookies to bake evenly, particularly by keeping them from browning too much on the bottom. An oven thermometer is helpful for determining your oven’s actual temperature. I like to line baking sheets with parchment paper or a silicone mat, both of which keep cookies from sticking and make cleanup much easier. The parchment paper can be reused from batch to batch. Bake the cookies in the center of a preheated oven. Adjust your oven racks if necessary. Every oven has a hot spot where the cookies will bake more quickly. To compensate for this, rotate the baking sheets halfway through the baking. Turn the ...