I mean the one you do when you want something easy to do, but not when you're tired at the point you microwave a frozen-meal, or just cut down a piece of cheese and put it in a bread
While you cook up some boxed mac and cheese on the stove, cut up some broccoli and onions or whatever appropriate veggies you have lying around, and open a can of tuna (any kind of cooked protein is fine, so fry and shred some chicken breast or ground beef if you're feeling ambitious.) When that's done, mix it together in a casserole dish, throw some cheese on top and chuck it in the oven until it turns a bit brown.
I don't even go that far. A can of chicken and some frozen peas (heated in some water in the microwave then drained) go into the final mix. Eat it from the pan or a plate if you're feeling fancy.