– 2¼ cups (270 g) all purpose flour – 1 tbsp (8 g) cornstarch – ½ tsp baking powder – ¼ teaspoon salt – ¾ cup (150 g) granulated sugar – 2 lemons zested – 1 cup (226 g) unsalted butter, room temperature (soft, but still slightly cold) – ¼ cup (30 g) powdered sugar – 1 large egg yolk (US), room temperature – 1 tsp (5 ml) vanilla extract – 1 tsp (5 ml) lemon extract – ½ cup (60 g) powdered sugar for coating cookie
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