I used a cake mix but replaced the oil by Apple sauce and added 1 Teaspoon Cinnamon.
Cut the cake sheet to fit the cloche...The cake need to be frozen before you cut it !
2 layers...Frost with chocolate frosting...
I used Non-pareil sprinkles...Moved the cake on cake stand. The cake is still frozen, so very easy to move.
The skeleton marshmallow goes on top of the cake.
Add some Jewelry.