In a medium saucepan, combine the cream soda and butterscotch sauce over medium heat. Stir gently to mix them well and let the flavors meld together.

Continue heating until the mixture is warm but not boiling.

In a separate bowl, whisk together the heavy cream, vanilla extract, and ground cinnamon until soft peaks form.

Pour the warm cream soda mixture into mugs, filling them about three-quarters full.

Spoon the whipped cream mixture over the top of each mug.

If desired, sprinkle a pinch of extra cinnamon on top.

Serve and enjoy your Butterbeer!