Aluminium packets you can put directly into the coals or on a grill. I also make them in the oven. I might have to make some this weekend myself.
Thinly sliced potatoes make up the bottom layer, season them how you like. Then I use chicken in the middle again, seasoned how you like. With veggies on the top. I use broccoli, cauliflower, and carrots. But some butter in and a little water to help steam.
I flip them halfway on the grill so they can get a bit of colour on the veg.
You can make them ahead. They take about 20-30 minutes to cook.