1 (18.25 ounce) package yellow cake mix
1 (3.5 ounce) package instant vanilla pudding mix
8 ounces sour cream
8 (1 ounce) squares German sweet chocolate, grated
1 cup semisweet chocolate chips
Preheat oven to 350 degrees F (175 degrees C). Lightly grease and flour one 9x13 inch cake pan.
Mix all ingredients and pour into prepared pan.
Bake at 350 degrees F (175 degrees C) for 55 minutes.