Mix cake mix as directed on box. Grease baking pan (9x11), spread coconut and nuts on bottom of pan. Pour cake mix over coconut and nuts.
In large bowl combine cream cheese and butter. (I place items in glass bowl and microwave till cream cheese and butter are very soft.) Stir together and slowly add powdered sugar to cream cheese mixture. Then pour cream cheese mixture over cake evenly.
Bake at 350 degrees F for approximately 30-40 minutes.