If you want off-the-wall, I know REI has a great selection of just add water freeze dried meals. I've always wondered what they taste like!
Leave it to a Seattle Girl to think of REI.
Am currently looking at their outlet site for GSI stuff for two upcoming camping trips, and waiting for a new cooking pot to get to the store (ordered online).
I don't really have much to contribute to this thread b/c we generally keep our "homemade" food to snacky-type things. But for those times when you don't want park food and don't feel like heating something in a microwave, I wanted to let you know that some of the off-sites have BIG meals. We had a nice dinner for the 3 of us, later in the evening so we were hungry, from Millie's. Got to-go, a salad, their mac and cheese, and garlic bread, for just a bit over 10 bucks (plus tip if you like to tip for take-out) if memory serves. It was SO good! And very filling.
And if you get hungry in the parks, know that sharing food is possible, to keep costs down (Blue Bayou, and Cafe Orleans at lunch/dinner, charge a small split-plate fee, but BB is NOT a budget place to begin with,LOL). Tomorrowland Terrace has big breakfasts that include a beverage. The penne pasta at Plaza Inn is HUGE, and hubby and I had to force ourselves to finish it, along with the garden salad we shared. I've ordered kid's meals for myself at Rancho del Zocalo and Plaza Inn, and those include a little beverage, along with apple slices and carrot sticks generally.
And so on and so forth, for those times when you just can't deal with cooking something in your room.