Preheat oven to 350° and lightly spray a 15x10 inch jelly roll pan with a non stick spray.
In a small bowl, mix cream cheese, marshmallow fluff, powdered sugar, and vanilla together until combined. Place in refrigerator until ready to use.
Prepare cake mix according to package directions.
Pour cake batter onto prepared jelly roll pan.
Bake for 15 minutes or until toothpick inserted in center comes out clean. Cool completely.
Using a small biscuit cutter, cut circles in cake
Each mini cake will have 3 pieces of cake.
Spread frosting mixture on the top of one piece of cake, stack another piece of cake on top of the frosting and add another layer of frosting. Top with the third piece of cake and add frosting and sprinkle cake crumbs on top of the frosting.
Secure each stack of mini cakes with a kabob stick, if desired.