INGREDIENTS
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¾ pound penne
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1½ 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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½ cup packed freshly grated Parmesan
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2 tablespoons sour cream
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¾ teaspoon lemon zest
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1½ teaspoons chopped fresh thyme
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Salt and freshly ground black (or white) pepper
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1 extra large egg yolk