There are a lot of delicious Birthday Cake recipes that can be found online, but not all of them are low in calories. If you want to make something that is a bit more healthy than a normal cake recipe but is still easy to make, there is an easy way to do it! The first thing to do is buy a boxed cake mix, any flavor that is desired. From here grab a twelve ounce can of diet soda, any flavor you would like. Simply combine the cake mix with the soda and bake in the oven according to the directions on the box. Don’t add in the ingredients on the box, like the eggs and the oil. There are a bunch of different combinations that can be used. Diet cream soda with yellow cake mix taste really good! This will result in a moist cake that is low in calories.