Combine the first 5 ingredients in a large bowl. Gently mix until combined. Divide meat into six equal portions. Form patties.
Create 6 large rectangles of heavy duty foil. Mist with cooking spray.
Spoon 1/3 cup mushroom soup onto each rectangle.
Divide potatoes between packets along with the carrots. Season with salt and pepper.
Top with a hamburger patty and onion slices. Add additional mushroom soup if desired.
Seal each packet securely.
Oven Cooking:
Preheat your oven to 350 degrees. Cook your foil dinners for 35 minutes or until the meat reaches a temperature of 160 degrees.
Campfire Cooking:
Cook over hot campfire coals for 45-50 minutes or until the meat reaches a temperature of 160 degrees and the vegetables are soft.Be sure to check periodically and turn and rotate until done.