My mother and Aunt Mimi used to make a variation of these brownies using crème de menthe, which made the filling layer green. One year for St. Patrick’s Day, I decided to replace the crème de menthe and its green coloring with Irish cream liqueur for a different flavor that still maintained the Irish theme. These brownies are very versatile: you can substitute amaretto, Grand Marnier, or crème de menthe for the Irish cream to make variations. They can also be made ahead and
