INGREDIENTS
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3 2/3 cups all-purpose flour
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2 1/2 teaspoons cream of tartar
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1 1/2 teaspoons baking soda
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1/2 teaspoon kosher salt
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1/3 cup unsweetened cocoa
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1 3/4 cups butter, softened
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2 1/2 teaspoons vanilla extract
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2 1/3 cups sugar, divided
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4 teaspoons cinnamon, divided
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3 large eggs