"from Taste of Home Christmas 2011 Cookbook..."
INGREDIENTS
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1 cup unsalted butter, room temperature
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1 cup sugar
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1 egg
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1 egg yolk
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1 teaspoon vanilla
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2 1/2 cup all-purpose flour
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1/2 teaspoon salt
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1/3 cup Nutella or chocolate hazelnut spread
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1/4 cup finely chopped hazelnuts