Step 1

Pour milk, ½ cup cream, sugar, and butter into a saucepan and whisk together. Place over medium-low heat and simmer until sugar dissolves.

Step 2

Remove from heat and stir in the butterscotch sauce.

Step 3

Whip the remaining cream to soft peaks and fold it into the slightly cooled butterscotch mixture until smooth.

Step 4

Divide the mixture into 2 large mugs and top with cream soda. Serve immediately.