INGREDIENTS
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2 1/4 cups flour
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1/2 cup cocoa powder
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1 teaspoon cream of tartar
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1/2 teaspoon baking soda
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1/4 teaspoon kosher salt
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1/2 cup butter, room temperature
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1 1/2 cups sugar
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2 eggs
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1 teaspoon vanilla
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cinnamon sugar (3 tablespoons sugar plus 1 teaspoon cinnamon)