In the past, before I started having issues with dairy, I'd have gone with cold pizza. During undergrad, I'd have probably gone with pop-tarts.
These days, I prefer making hash -- when I bake potatoes, I'll bake a few extras, so in the morning:
- preheat a large skillet
- cut up potatoes, some bell pepper, onion, whatever other interesting is in the fridge (sausages, leftover steak or corned beef, etc.)
- add oil to pan, start browning the potatoes
- While waiting, get dressed, check e-mail, etc.
- flip the potatoes and add the rest of the stuff to warm through.
- season w/ whatever's on hand. (seasoned salt, adobo, salt and smoked paprika, etc.)
- If desired, crack over and egg or two and cook for another minute
- serve
If I have leftover rice, I'll make nasi goreng.