Prepare a 12-cup bundt pan with cooking spray and flour; set aside.
In a mixing bowl combine cake mix and baking powder; set aside.
In another mixing bowl, combine blueberries, sour cream, egg whites, oil and lemon 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.
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