McDonald's Rolo McFlurry has vanilla soft serve with notes of chocolate and hints of caramel. Burger King's new Mushroom & Swiss King sandwich has a half a pound of beef, sautéed mushrooms, and crispy bacon. Delivery is now available at select Denny's locations. Sonic's Pretzel Dogs are served on a pretzel bun with melted cheese sauce and crispy bacon. Baskin-Robbin's June 2017 Flavor of the Month is made with TWIX bars.