This is one of my favorite summer potato recipes. It's so easy to make. I like to cook mine a little longer, so those potato and onion slices at the bottom of the packet are browned and buttery crispy. I like to cook these potatoes while grilling meat, so everything is done all at once without too much effort. Whenever I make this, we fight over who gets to scrape the bottom of the packet for the browned bits of potatoes and onions.