This dessert came about totally by accident! I was trying to make one of the many WW cakes that use diet soda and cake mix into muffins. I didn't use liners and didn't spray my muffin tin with enough Pam, and they stuck miserably! So I looked in my fridge to see what I had on hand, and threw this together to layer. It really turned out pretty, and was delicious too! I highly recommend Waist Watchers soda in any cake you make. It is sweetened with Splenda and every flavor is calorie free, aspartame free, caffiene free, sodium free, and fat free. It actually costs less than other diet sodas too! I have only made this once on the spur of the moment, so feel free to make any adjustments needed. Feel free to try white or yellow cake with different flavors of yogurt and diet soda as well. It could also probably be made with a regular cake mix, but would make more like 20-24 servings than the 16 by using 2 Jiffy boxes. Thanks to Kittencal and recipe#79506, I have found a way to keep the yogurt in recipes from becoming runny and watery! I don't know if this would work using flavored Jello, but next time I make it I might try using the sugar free lemon Jello to give even MORE lemon flavor!