Preheat oven to 350 degrees. Spray bundt pan with non-stick cooking spray, sprinkle with flour.
Combine the cake mix, sherry, water, egg and egg whites, oil, pudding mix and sour cream. Beat for 2 minutes. Add the poppy seeds and beat for another minute.
Spread into pan; bake for about 45 minutes.
Cool for 10 minutes in pan, then turn onto serving platter to cool. Sprinkle with powdered sugar.
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