Scrub the potatoes then make a little cross on the top of each one so they don’t explode in the oven. You can microwave them, wrapped in kitchen paper, for about 5 mins but if you like the skins crispy then rub them with a little oil and bake them for about an hour in the oven at 180 degrees C, gas Mk 5.
Meanwhile grate the cheese into a mixing bowl and add the butter, milk and a little pepper. Don’t add salt as the cheese contains plenty.
When the potatoes are soft hold them in some folded kitchen paper and cut the tops off neatly using a small sharp knife.
Scoop out the insides carefully into the bowl using a teaspoon, put the skins on one side for later. Mix it all together until the mixture is smooth and creamy then spoon it all back into the potato skins.
Sprinkle with your choice of chopped toppings, plus a little extra cheese and grill or bake until brown.