FOR THE COOKIES: – 3 cups (375 grams) all-purpose flour, spooned & leveled – 2 teaspoons cream of tartar – 1 teaspoon baking soda – 1 teaspoon ground cinnamon – 1/2 teaspoon salt – 1 cup (230 grams, or 2 sticks) unsalted butter softened – 1 cup (200 grams) granulated sugar – 1/2 cup (100 grams) light brown sugar packed – 1 large egg room temperature – 1 large egg yolk room temperature – 2 teaspoons pure vanilla extract FOR THE CINNAMON SUGAR COATING: – 1/4 cup (50 grams) granulated sugar – 2 teaspoons ground cinnamon
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