Butterbeer

Best approximation that I can come up with based on the drink served at Universal Studios, Florida

Cream Soda Base with a shot of Vanilla Vodka and a Shot of Buttershots.
Mix Whipped cream with 1/2 shot of vanilla vodka and buttershots to form the head. Mix in some butterscotch syrup into the whipped mix and top off the cream soda. It's yummy!