Cake
2/3  cup butterscotch chips
1/4  cup water
2 1/4  cups Pillsbury BEST® All Purpose or Unbleached Flour
1 1/4  cups sugar
1  teaspoon baking soda
1  teaspoon salt
1/2  teaspoon baking powder
1  cup buttermilk*
1/2  cup shortening
3  eggs
Filling
1/2  cup sugar
1  tablespoon cornstarch
1/2  cup half-and-half or evaporated milk
1/3  cup water
1/3  cup butterscotch chips
1  egg, slightly beaten
2  tablespoons margarine or butter
1  cup coconut
1  cup chopped nuts
Seafoam Cream
1  cup whipping cream
1/4  cup firmly packed brown sugar
1/2  teaspoon vanilla