Cut margarine into cake mix until crumbly. Mix in coconut. Pat mixture lightly into ungreased 13x9-inch pan, building up edges slightly. Bake 10 minutes at 180ºC . Arrange apples on warm crust. Mix sugar and cinnamon and sprinkle over apples. Mix sour cream and egg together well. Drizzle this over the apple and cinnamon layers. Return to 180ºC oven, and bake for 20 minutes more, or until lightly browned. Makes 1 13x9 inch cake. ----