Shorty, the previous recipe for this cake was without pudding and was made in a 9x13 cake pan. I made it yesterday in the 9x13 and it came out great, but I reduced the time to 45 minutes since the cake is not as thick. You also end up with being able to use 8 pineapple slices rather and 5 as the picture shows. As for the pudding, I believe the original version of the recipe called for using the standard recipe on the box for the cake. I was planning to use pudding mix o add more body to the cake. I'd recommend using it. Yesterday was the first time I used it and this may be the best pineapple upside down cake I've made.