My current butterscotch recipe is a simple brown sugar, butter, and cream. When attempting to use it as a topping for ice-cream, I have to heat it up to warm/hot to get it to be a liquid. After pouring it on some ice-cream, and in the time it takes to walk 20 feet from kitchen to living room, the butterscotch has already come back to cold and has become a sticky, solid texture.
What can I add to my butterscotch to lower its freezing/solidifying point so that it remains a viscous liquid when added to ice cream (like a consistency between maple syrup and molasses)?