And, even just start w/ Icecream as the filling!
Pre-fill, pop in the freezer.
Before serving, heat up some choc sundae sauce, (or even peanut butter!), take the icecream cups out of the freezer & drizzle with the sauce.
For christmas, a sweet version would be a french vanilla icecream, a rum sauce & use some diced candied fruit (like you put in a fruitcake) as your final topping!