his recipe is everything you love about classic chicken fajitas, wrapped up into a fuss-free, all-in-one foil packet. As it cooks on the grill, the bell peppers and onions caramelize and the chicken becomes perfectly moist and tender. Serve with rice or tortillas, then let everyone dress up their own foil packet — sliced avocado, a dollop of sour cream, lime wedges, and chopped cilantro are all delicious options.