Light & Easy Chocolate Cake

I got this recipe from a Weight Watchers meeting I was attending & made it for both Thanksgiving & Christmas Eve dinners (as well as some other times), it was enjoyed at both occassions. The cake has a nice chocolate flavor, but isn't too heavy after such big meals. Instead of using the oil or whole eggs in the batter, this recipe uses a can of soda & egg whites - it may sound odd (as it did with my dad), but it tastes very good.