INGREDIENTS
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8 tablespoons (1 stick or 1/2 cup) unsalted butter
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2 cups packed brown sugar
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1 cup all-purpose flour
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1/2 cup whole-wheat pastry flour
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1 teaspoon baking powder
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1 teaspoon salt
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2 large eggs
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1 teaspoon vanilla
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1/4 teaspoon rum flavoring
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1 1/4 cups chopped walnuts, toasted