Fresh Apple Easter Cake

Source: Washington Apple Commission

1/2 cup walnuts, chopped
1 (18 ounce) box spice cake mix
1 small box instant butterscotch or vanilla pudding and pie filling
4 eggs
1/2 cup vegetable oil
1/2 cup cold water
3 medium Washington apples (Braeburn or Granny
    Smith) peeled, cored and coarsely chopped
1 cup golden raisins
Confectioners