Snickerdoodle Topping – ¼ cup (50 g) granulated sugar – 2 tsp (6 g) ground cinnamon Snickerdoodle Cookie Dough – 2½ cups (300 g) all purpose flour – 2 tsp (12 g) baking powder – 2 tsp (5 g) cornstarch – 1 tsp (3 g) ground cinnamon – ½ tsp salt – 1 cup (226 g) unsalted butter, softened but still cool to the touch – 1¼ cup (250 g) granulated sugar – 1 large egg (US), room temperature – 1 large egg yolk (US), room temperature – 2 tsp (10 ml) vanilla extract
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