They might not fit in your box but I take at least two cast iron skillets along. One is about 3 inches deep and the other about 1 inch and it doubles as a lid. If you cook on a stove cast iron will save you a bit of fuel because they store heat. Also, I can bake a loaf of bread in about 35 minutes with this setup -- on top of a stove. Both skillets stow away in a canvas bag. The third is a deep dutch oven that awaits duty in its own canvas carry bag.
Simple bread recipe : 4 cups flour (I use 3 to 1 white to wheat) mix together with a spoon or fork adding 1 table spoon sugar, 2 teaspoons salt, 1 table spoon olive oil, optional. One packet of dry yeast dissolved in 1 cup of water. Mix it all up and add another 1 to 1.5 cups water but not all at once. You want the mixture to be sticky wet but not gooey wet. Let it rise for a while -- maybe one hour, maybe three depending on temperature and schedule -- in a pan that fits inside of your cast iron oven. Any pan will work. An old sauce pan with the handle cut off works, or whatever. While the dough rises, covered up with a towel of course, go catch a fish or ...... See you all at supper time. Prep time is about 5 minutes. Bake time should run 30 - 35 minutes. Stick a stick into it (see posts above RE: sticks) and if it comes out completely dry, its done.
The dry ingredients can be measured up in a zip lock bag before leaving home. An alternative cooking method that I often use on the trail, and at home, is to make the dough, store it in the fridge and pinch off what I might need for the meal and let it warm up a bit on the cutting board. It will rise some. Then, I pat it out like a tortilla or roll it out using a coffee cup, peanut butter jar, or whatever. Drop a little oil on the skillet and slap the dough on the hot pan and FRY bread in just a couple minutes.
A spray bottle of bleach water would be a good addition for sanitizing cutting boards and other surfaces, like picnic tables.
Unless you raise and butcher your own meat, and grow your own veggies everything you eat has come in contact with plastic at some point in the distribution chain. 
I much prefer wood or bamboo cutting boards (it's what use at home) but don't have a great way to organize my camping gear yet, so I'm going with UHMW plastic type for now. They take abuse better than wood, and sterilize in the dishwasher. There's a variety pack of three at HFT (of course) for about $8 right now.
