Pour the cream soda into a pan and bring it to a boil.
12 oz 4 cans of cream soda
Melt the butter and stir in the brown sugar until it dissolves.
3 Tablespoon butter, 3 Tablespoon brown sugar
Once the cream soda is boiling pour in the brown sugar and butter mixture and stir. You have to watch this part, and make sure the bubbles in the cream soda are actually from boiling, not just from carbonation. If the soda isn't boiling the butter/sugar will harden.
Add the half and half and the candy and stir until dissolved.
3/4 cup half and half, 5 Werthers Original candies