We're mostly vegetarian, but those suggestions include eggs because we almost always have a couple of eggs even if the rest of the fridge is empty. And, yeah, we do love eggs!! If all else fails, you can make cheese grits and eggs, or a clean-the-fridge frittata, or...or...
I do the make ahead thing a lot, but sometimes thinking ahead means making sure your pantry/fridge has something in it that can make your belly NOT HUNGRY in five minutes or less. I really recommend stocking up on the frozen brown rice...good stuff, good for you, cheap, versatile. I use it even if I'm not in a hurry, like mixing it with cheese and vegetables to stuff roasted poblanos, or as the base of a broccoli casserole.