Our favorite iced coffee for this cocktail is Dunkin’ Donuts Mocha flavor, the kind you can purchase at the grocery store. Because these already come sweetened it's not necessary to add sugar or other sweeteners. You can use whatever your favorite is!
If you decide to use plain black iced coffee you may want to adjust the sweetness by adding flavored coffee creamer or simple syrup to the mix, if that's how you enjoy it. You can also make some of your own cold brew coffee at home to use in this cocktail!
You can substitute the vanilla vodka with regular vodka if desired.