"Camilla Saulsbury..."
INGREDIENTS
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3 cups all-purpose flour
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2 1/4 cups packed light brown sugar
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2 teaspoons baking powder
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3/4 teaspoon salt
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1/2 teaspoon baking soda
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4 large eggs, at room temperature
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1 cup sour cream
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1/2 cup unsalted butter, melted and cooled slightly
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1/4 cup vegetable oil
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1 tablespoon vanilla extract
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1 1/2 cups white chocolate chips
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1 cup coarsely chopped toasted macadamia nuts or 1 cup pecans