Melt butter in the microwave until a liquid
Stir Torani syrup into the butter until blended
Add the rootbeer and cream soda to a large pitcher
Stir syrup and butter mixture into the soda (do this gingerly to limit fizzing)
Add the ice cream into the glasses/mugs
Pour the drink mixture over the ice cream
Add the ice cubes if you made them
Top with whip cream, drizzle with the syrup topping and enjoy!
Another way to make this is:
Melt butter in the microwave safe dish until it's a liquid
Add all of the ingredients, except for the syrup and whip cream, into a blender
After everything is mixed together thoroughly, pour into glasses, top with whip cream and the syrup and enjoy!