Simpson, married to his childhood sweetheart for almost 19 years, had walked out on his wife and kids and into the arms of a younger woman. The breakup surprised his wife, his friends and even Simpson himself. Looking back, he says, it was a classic midlife crisis.
In that we have already provided the definitive answer to this question elsewhere (relying on rum extract), we assume your follow-up is seeking a non-alcoholic substitute for rum (as extracts can be as alcoholic as or more alcoholic than the spirits they replace).
Orange rum extract works very well for most kinds of cakes and cookies that call for rum extract, but I find that you can get an especially good taste in chocolate cookies. It's almost like a chocolate orange flavor, and the orange rum gives it a nice twist.