This is a Weicht family recipe that has been passed down for several generations. Whenever our extended family is gathered together, these brownies are always brought by someone. They often disappear quick too. These marshmallow brownies are perfect for welcoming September (and with September - Autumn), because they have butterscotch, chocolate, pecans, and marshmallows in them. The ingredients (particularly the butterscotch and the pecans) scream Autumn to me. Whether it's a family get together, an Autumn picnic, or a sweet craving, these disappearing marshmallow brownies are the perfect dessert for the event!