Peel the potatoes and cut them into medium pieces. Place them in cold, salted water and simmer until tender enough to mash.
Heat the oven to 200C
Drain them, return them to the saucepan and mash with a fork. Finish with a potato masher until smooth and fluffy.
Mix the butter with the chopped garlic and parsley. Add it to the potatoes with the milk and cheese and season with salt and pepper.
Stir thoroughly until smooth and combined.
Tip the mash into an oven-proof dish and top with grated cheese.
Bake in the oven for around 25-30 minutes until the top is golden brown
