Aunt Betty's 1-2-3 Cake - Genius! I LOVE this idea!!! You need two boxes of cake mix. One can be any flavor you prefer, but the other MUST be Angel Food cake mix. Mix them together (shake them in a big ziploc bag or stir them together in a big bowl). Then simply store the mixture in an airtight container until you get the urge for dessert. Then just put three tablespoons of the dry mixture in a big coffee mug and stir in two tablespoons of water. Microwave it for one minute.