Dump in the pineapple and spread it around. Dump the pie filling on top of the pineapple and spread it around. Spread the whole box of dry cake mix on top of that. Cut up the butter and add it on top of the dry cake mix and then add the walnuts. Bake at 350 for about 40 minutes but keep watch, once the cake and walnuts look done it's probably done. It's normal for some of the cake mix to still be dry underneath the top. This is a yummy dessert for any occasion.