If you want to bake up a scrumptious Snickerdoodle cookie with that classic soft and chewy texture, there are a couple of tips to get you the best results. First, don’t skimp on the cream of tartar. That’s what gives the Snickerdoodle that twist of tanginess. (If you don’t have it, go buy a nice fresh bottle. You may be making these a lot!) Next, whisking the butter and sugar together for a long time is important because it whips air into the cookie dough, which helps make them soft and chewy. So whisk for at least 5 minutes until light and super fluffy. (Christina Tosi, cookbook author and owner of the award-winning Milk Bar Bakery says that under-whisking the butter and sugar is the biggest mistake home cooks make.) Then, don’t over bake the cookies. You want that chewy center. Finally, roll the dough in the cinnamon sugar mixture twice. The topping here is just as important as the batter. So now, go gather up your room temperature butter, eggs and the rest of the ingredients, because, a day without a Snickerdoodle is just plain crummy!