To ensure your holiday cookies come out perfectly, follow these tips:
Room temperature ingredients: This perennial plea is probably the most important. When creaming butter and sugar to make cookie dough, you’re doing more than simply getting the two ingredients to a similar, smooth consistency. You’re also creating an emulsion so that all the ingredients stay together when baked, giving you a homogenous dough for your cookie. If you use cold butter, it takes longer and will be more difficult to combine with the sugar. Likewise, if you use cold eggs, it can seize the butter when you add them, causing the mixture to appear split and lose its emulsion.
If you plan ahead, the easiest way to get room temperature butter and eggs is simply to leave them out overnight on your counter the day before you plan to bake (I promise, it’s safe). But if you didn’t plan ahead, here are the methods I use to quickly get “room temperature” butter and eggs.
For butter, place the stick, still closed in its wrapper, in the microwave and heat in 5-second bursts until it’s just soft to the touch; this usually takes no more than two or three bursts for one stick.
For eggs, place the eggs, still in their shells, in a bowl and cover them with hot tap water. Let sit for 1 minute, then pour off the water and cover the eggs again with fresh hot water. Let sit for at least 5 minutes — or while you prep the rest of your ingredients — until they lose their chill and are room temperature throughout.