"In 'Cake Keeper Cakes' by Lauren Chattman..."
INGREDIENTS
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1 1/2 cups unbleached all-purpose flour
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1/2 teaspoon baking powder
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1 teaspoon baking soda
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1/4 teaspoon salt
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1/2 cup unsalted butter, softened
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3/4 cup firmly packed brown sugar
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2 large eggs
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1/2 cup sour cream
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1 tablespoon grated orange zest
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1 teaspoon pure vanilla extract
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1 cup semi-sweet chocolate chips
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2 tablespoons sour cream
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3/4 cup powdered sugar
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1/2 teaspoon pure vanilla extract