cream cheese softened
stick of margarine softened
Bake white cake according to box directions in a 9x13 pan.
Punch holes in the cake and pour juice from pineapple over it.
Cream butter & cream cheese until fluffy. Add powdered sugar a little at a time. Add milk and continue to beat until you reach your desired consistency. Stir in vanilla.
Frost cooled cake. Place drained pineapple over frosting and refrigerate.