This recipe has to be one of my kids favourites. It is great because it can be prepared early and just popped into the oven for the last 20 minutes. Here's what you do.
Boil or microwave clean unpeeled potatoes until soft. Place them into a china baking dish (ie lasagne dish) and smash them up with a potato masher until they are broken up into small pieces.
Pour over them a good slosh of good quality of olive oil. Sprinkle over a liberal amount of good salt and fresh rosemary leaves.
(At this stage you can store in the fridge until later if you want to get organised earlier in the day)
Bake in the oven for 20 minutes.