Place glass mug or cup in freezer to frost.
Scoop ice cream and drop into blender.
Pour cream soda into blender. Adjust amount based on desired thickness.
Add butterscotch syrup and rum extract to your concoction.
Blend on high until sufficiently mixed.
Pour carefully into your frosted glass.
Add a dollop of whipped cream, a small handful of butterscotch chips, and carefully drizzle more syrup to top it off!