Preheat oven at 180ºC . Prepare a 12-cup Bundt pan with cooking spray and flour; setaside. In a mixing bowl combine cake mix and baking powder; set aside. Inanother mixing bowl, combine blueberries, sour cream, egg whites, oil, andlemon peel. Mix dry ingredients with wet ingredients just until moistened.
Pour batter into prepared pan. Bake for 40 minutes.
Serving Ideas : Serve warm or cool with powdered sugar or whipped cream.