How about tortilla? It works really well with pretty much whatever is left in your fridge (admittedly you do need eggs ), its lovely cold the next day for packed lunches and everyone eats it.
You need a large frying pan.
Depending on size:
4-6 large eggs
Splash of milk
Potatoes: sliced and pre-boiled
Onion: chopped fine
Green veg: any combination of courgettes (sliced in half moons), green beans, peas, beans.
Leftover red/green/yellow peppers, chopped fine can be nice but not essential
Cheese: grated parmesan/cheddar/anything else. Some goats cheese is always nice chucked in as well if you have any.
Salt, pepper, herbs (oregano, mint, chives, whatever you have)
Chop and gently fry off onion on a low heat so it is cooked and just a little bit brown. Chuck in sliced boiled potatoes to brown a bit, then add the green veg. Cook for about 2 mins. Beat eggs with milk, season and add herbs and approx half the grated cheese. Pour egg mix over veg in pan and leave on heat to set on the bottom for about 4-5 mins. Once the bottom is properly set and the top is still runny, add the rest of the grated cheese (and any goats cheese if you have it) to the top, and put under a hot grill for a few more minutes until the cheese is melted and the omelette is set through.
Slice into wedges and serve hot or cold with nice bread or toast, and salad.
Good luck!