INGREDIENTS
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1 cup packed light brown sugar
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1 cup all-purpose flour
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2 teaspoons cinnamon
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1/4 teaspoon salt
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1 stick (1/2 cup) cold unsalted butter, cut up
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2 1/4 cups all-purpose flour
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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1/2 cup (1 stick) unsalted butter, softened
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1 cup sugar
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2 eggs
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1 teaspoon vanilla extract
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1 cup buttermilk (or 2 tbsp white vinegar and 3/4 cup plus 2 tbsp milk)