Hot Chocolate Igloo Cake

Name: Hot Chocolate Igloo Cake
Yield: 0
Ingredients: 2 chocolate box cake mixes, prepared; 1 packet hot chocolate mix; 1 1/2 cups chocolate chips; 1 cup heavy cream; 1 1/2 cups chocolate chips; 1 chocolate cake donut; 3 cups chocolate buttercream; 3 cups vanilla buttercream; 8 cups mini marshmallows