Heat oven to 350 degrees. Combine sugar and butter in a large mixer bowl. Beat at medium speed, scraping bowl often, until creamy, 2 to 3 minutes. Continue beating, adding eggs on at a time, until well mixed, 2 to 3 minutes. Add sour cream, milk and vanilla. Continue beating, scraping bowl often, until well mised, 1 to 2 minutes. Reduce speed to low. Add flour; beat just until moistened.
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