Make and bake cake mix according to instructions on box, using 3 8-inch round cake pans. Let cool completely.
Whip cream with Dr. Oetker Sahnesteif according to package instructions. If you are using powdered sugar, add to heavy cream and whip until stiff.
Place one cake layer on a serving plate. Cover with pie filling, saving some to decorate the top. Place next layer on top. Cover with about a third of the whipped cream.
Gently place top cake layer on top of whipped cream. Spread the remaining whipped cream over the top and sides.
To decorate the top, spoon on the remaining pie filling.
