This is a great cake for a crowd. Because it is so rich it severs a lot of people and there sure won't be any leftover if your serving a crowd. My family loves this cake and I always make this when we are having party's.
Mix Cake mix as directed on box. Pour this into a 9x13 cake pan that is greased and floured.
In a bowl combine the ricotta, sugar, eggs,and vanilla. Mix well. Spooon over top of unbaked cake. Bake for 1 hour in a 350 degree oven. Cool completely.
Mix pudding with the milk and fold in whipped topping. Spread over cake and then refrigerate until topping is set or ready to sevre.
NOTE: For marble cake you can use a yellow cake mix and hold out one cup of yellow mix already made and mix 1/4 cup of cocoa into the one cup of yellow mix. spoon the cocoa mix over yellow cake mix and run a knife thru it to make a marble cake.