Instructions: Melt butter in a dutch oven; add leeks and celery; saute until tender. Add flour, cook, stirring constantly, 3 minutes. Stir in broth, 3 cups water, and salt; bring to a boil. Reduce heat; simmer, stirring occasionally, 15 minutes.

Microwave cream cheese and yogurt in a 2-quart microwave-safe bowl at HIGH 15 to 20 seconds or until warm; whisk until smooth. Whisk in egg yolks; gradually whisk in 2 cups leek mixture. Stir cream cheese mixture and pepper into leek mixture. Cook over low heat, stirring occasionally, until thoroughly heated. (Do not boil.) Sprinkle with chives, if desired.

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