Preheat the camp oven to 350 degrees F (175 degrees C).
Heat a large skillet over medium-high heat and add the ground beef to brown. Drain any excess fat.
Add the onions and cook until transparent.
Add the cans of cream of mushroom soup and cream of chicken soup, then rinse the cans with a small amount of water and tip into the skillet. This will be about 1/4 cup of water.
Add the vegetables to the casserole and stir in gently, being aware that canned vegetables tend to be soft and can easily become mushy.
Spread the tatter tots across the top of the casserole. Place the skillet in the preheated camp oven to cook for 45 minutes.Tip: For a reduced cooking time you can start to cook the frozen tatter tots in another pan then add them to the base when it is ready.