In addition to chicken thighs, chicken breasts and ground beef patties can be cooked in a foil packet. Sprinkle the meat with salt and black pepper. All kinds of vegetables can be cooked with the meat, including carrots, mushrooms, zucchini, red onion or green onion, broccoli, cauliflower - really any veggies that can be roasted in the oven can be used in a foil packet.