Cool in pan, set aside. birthday cake frosting method: 1. Bake at 350° F. for about 35 minutes in a greased and floured 15 x 10 x 1 inch jelly roll (I used a 9-/12 x 13 pan). Combine the butter, shortening, and cream cheese in the bowl of a stand mixer fitted with the paddle attachment and cream together on medium-high for 2 to 3 minutes, until the mixture is smooth and fluffy. Prepare cake mix according to package directions, using the reserved pineapple juice and water for the liquid called for in the directions. Hawaiian Dream Cake ~ a layered delight with pineapple-and-coconut laced yellow cake base, layer of creamy pineapple pudding, and freshly whipped cream … A lot of Hawaiian history has been dropped with the new repackaging and streamlining of the original Happy Cake recipe mainly the size of the cake and disappearance of the grated coconut which has greatly reduced the overall taste and impact of the Happy Cake especially on those of us who gave away the original Happy Cakes as annual mainland gifts.