INGREDIENTS
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1 cup (2 sticks or 230g) unsalted butter, softened to room temperature
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1 and 1/3 cup (267g) granulated sugar
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1 large egg
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2 teaspoons vanilla extract
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3 cups (375g) all-purpose flour
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2 teaspoons cream of tartar*
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1 teaspoon baking soda
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2 and 1/2 teaspoons ground cinnamon
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1/2 teaspoon salt
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1/4 cup (50g) granulated sugar
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1 teaspoon cinnamon