This is a delicious German recipe.
1 Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9×13 inch pan. Peel, core, and cut each apple into 8 wedges. Set aside.
2 In a medium bowl, combine the cake mix, coconut and margarine until crumbly. Pat mixture lightly into prepared pan, building up the edges slightly to form a crust. Arrange the apple wedges on top.
3 Mix together the cinnamon and sugar and sprinkle over the apples and the cake mixture. In a small bowl, whisk together the egg and sour cream. Drizzle over the top of the cake.
4 Bake in the preheated oven for 35 minutes, or until the edges of the cake are golden and the apples are tender.