A favorite childhood treat for many, marshmallow treats have the perfect combination of gooey and crunchy. For the adult palate, they sometimes come off as too sweet, and they don’t keep too well after a day or two. Problems solved here. First, the sweetness is balanced with salty pretzels, and drizzles of peanut butter and bittersweet chocolate. The shelf life is lengthened thanks to a great tip by Brooklyn pastry chef Libby Willis: The addition of sweetenedcondensed milk keeps these treats soft and delicious for days!