Heat the apple juice in a saucepan. Then put the egg liqueur - or, if you want it to be alcohol-free, the vanilla sauce - in a coffee mug, pour the hot apple juice over it and top it with a cherry on top. Sprinkle the whole thing with cinnamon or cinnamon sugar.
If you don`t have egg liqueur on hand, you can replace it with vanilla sauce and brandy, half each.