1. Make cake according to the package directions. Let cool and then crumble in a large mixing bowl. 2. Ganache: Mix whipping cream and butter in a stove pot. Boil gently and stir. Add chocolate chips and stir until melted. Let cool. 3. Mix 1 and 1/3 cups of this ganache in with the crumbled cake. Stir until all the cake is moistened. Press cake mixture into a wax paper lined cake pan. Freeze one hour. Frost with remaining ganache. 4. This cake looks nice garnished with rasberries or strawberries.
