In large mixing bowl, combine cream soda and butterscotch syrup. Whisk to combine.
In electric mixer with whisk attachment, beat heavy cream until stiff peaks form - this will take 2-4 minutes.
Fold in sugar and vanilla and melted butter until combined. Don't over mix.
Evenly pour cream soda mixture into four mugs and spoon on whipped topping.
(Optional) drizzle whipped cream with butterscotch or caramel syrup.
