Couldn't find any history of for this cocktail and in the book that I have there is only the recommendation that the ratios need to be respected in order for the taste to be the same as an oatmeal cookie. And it is.
1 ounce Baileys Irish Cream
1 ounce butterscotch schnapps
1 ounce Jagermeister
1/2 ounce cinnamon schnapps