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Adjust rack to middle position and preheat oven to 425 degrees. Allow ingredients to come to room temperature. Wash and dry produce.
In a large bowl, whisk together half the sour cream, two eggs*, ⅓ cup flour, ¼ cup milk, and a big pinch of salt until smooth (for 4 servings, use all the sour cream, three eggs, ½ cup flour, and ½ cup milk; save remaining egg for another use). (Be sure to measure the milk—we sent more.)