Take some cold cooked potatoes leftover from a previous dinner and fry up with half an onion in a bit of olive oil and a knob of butter. Adding the butter to the oil helps to stop the oil burning.
I added some of the leftover Italian chicken from another evening meal, warmed the sauce through and added a ball of chopped mozzarella cheese.
Serve, sprinkle with Parmesan cheese and enjoy! Internal central heating soon starts to work!!