INGREDIENTS
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1 cup butter, softened
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1 1/2 cups sugar
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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2 eggs
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1 teaspoon vanilla
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3 1/2 cups all-purpose flour
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1/2 cup blueberry preserves or jam
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1 1/2 teaspoons cornstarch
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1/2 cup very finely chopped toasted walnuts