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Place beans in a large saucepan and cover with water; bring to a boil.
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Cook, uncovered, for 8-10 minutes or until crisp tender.
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Meanwhile, in a large skillet, melt butter over medium heat.
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Stir in the flour, salt and pepper until smooth. Gradually whisk in broth. Bring to a boil; cook and stir for 1-2 minutes or until thickened.
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Remove from the heat.
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In a small bowl, combine egg yolks and milk.
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Stir a small amount of hot broth mixture into egg mixture.
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Return all to the pan, stirring constantly.
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Bring to a gentle boil; cook and stir for 2 minutes or until thickened.
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Stir in parsley. Drain beans; top with sauce.