Start by making your pudding according to the instructions on the package & let chill.
Next bake your cake according to the instructions on the package using a round cake pan. (I Cut the cake into 2 layers, then had enough batter to create a 3rd layer-half of a baking pan filled with batter).
While your cakes are baking, make your icing and keep at room temperature.
With your 3 cake layers cooled and ready to go, divide the pudding in half and gently spread it on top of 2 of the layers.
Add crumbled Nilla wafers & banana slices on top of the pudding.
Gently stack your layers, adding the 3rd layer to the top.
Carefully add your icing to the top and sides of your cake.
Add Nilla wafer crumbles to sides and top for decoration.
Add bananas to top for decoration.