Preheat your grill or campfire to medium heat.
Slice the potatoes, onions, and lemons.
Mince the garlic.
Lay out a large sheet of aluminum foil.
Place a portion of the sliced potatoes in the center of the foil.
Season potatoes with salt, pepper, and half of the dried thyme and rosemary.
Place a chicken breast on top of the potatoes.
Drizzle chicken with olive oil.
Sprinkle chicken with more salt, pepper, and the remaining herbs.
Add a few lemon slices on top of the chicken.
Sprinkle minced garlic over the chicken.
Add a layer of red onion slices over the chicken.
Fold the aluminum foil to seal the packet tightly.
Repeat steps 4-13 for the remaining ingredients, creating individual packets.
Place the foil packets on the grill or over the campfire.
Cook for about 20-25 minutes, ensuring the chicken is thoroughly cooked and potatoes are tender.
Carefully open the packets to serve, being cautious of the steam.