INGREDIENTS
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3/4 pound penne
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1 1/2 cups heavy cream or half-and-half
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3 tablespoons finely chopped yellow onion
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2 garlic cloves, minced
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2 tablespoons all purpose flour
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5 ounces goat cheese
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3 ounces sharp white cheddar, shredded
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1/2 cup packed freshly grated parmesan
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2 tablespoons sour cream
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3/4 teaspoon lemon zest
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1 1/2 teaspoons chopped fresh thyme
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Salt and freshly ground pepper
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1 extra large egg yolk