Peel and slice potatoes into quarters and boil for 25 mins or until tender

Peel and slice leeks and onion

Fry the leeks and onion in separate pans in a little vegetable oil until tender

Mash the potatoes in a large bowl with the milk then add the leeks, onion and cheese and mix well

Place bake into oven proof dish, sprinkle with cheese and bake for 20 mins