I have been making dream bars since 1990. It is a recipe I discovered in my Rose Levy Beranbaum Rose's Christmas Cookies (still, one of my favorites).
Prior to making these I had made a bar similar to this one, called a “7 layer bar”. It had butterscotch chips and white chocolate chips plus other things. And they were good, but I am not a huge butterscotch fan.
When I came across this recipe I had to try them. They immediately were a hit. I make them all year round and 75% of the time you can find some hidden in the back of my freezer. They were always and still are included in my holiday baking which I have done every year since 1990.