Stuffed Arepas, Mac 'n' Cheese and Doughnuts

Brad Miller gets a taste of Venezuelan street food at Arepas House food truck in Denver, Colo., where Chef Jorge Dominguez serves a traditional corncake sandwich filled with marinated flank steak, grilled pork sausage and creamy avocado sauce. In Nashville, Tenn., Brad checks out inventive macaroni and cheese from Chef Kayla Nicholson and The Mac Shack truck. Brad samples the Mac Waffles, a spin on chicken and waffles, with three-cheese macaroni baked right in. For dessert, he hits Atlanta, Ga., and the Simply Done Donut truck, where owner Karissa Norfleet presents a pair of sweet mini doughnuts.