The Reese’s brand is reviving iconic flavors that made childhood lunches memorable for its newest flavor mashup. Inspired by PB&J as well as marshmallow sandwiches of the past, Reese’s is introducing the new Reese’s Marshmallow Cup and bringing back the fan-favorite Reese’s Strawberry PB&J Cup, as limited-time offerings. The flavors offer a playful, elevated take…