INGREDIENTS
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2 1/4 cups all-purpose flour
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1/2 cup unsweetened cocoa powder
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2 teaspoons cream of tartar
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1 teaspoon baking soda
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1/2 teaspoon coarse salt
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1 cup (2 sticks) unsalted butter, room temperature
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1 3/4 cups sugar
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2 large eggs
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2 teaspoons cinnamon
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1/2 teaspoon chile powder (optional)