Mix the two cake mixes together and place in an air tight zippered bag. When you want to make a one serving cake, take 1/3 c. of this mixture and add 3 T. water in a single serving glass bowl (I use a mug). Add a small handful of chocolate chips and mix together. Microwave on high for 75 seconds. You may want to run a knife around the outside (but that is usually not necessary). Invert on to a plate. The chocolate chips make the frosting! Perhaps you may like to try caramel chips.