Boil 700g new potatoes in their skins until very tender, about 12–15 minutes. Drain well.
Melt 40g butter in a frying pan over a low heat and add 2 crushed garlic cloves. Fry gently for 1 minute, then tip the potatoes into the pan with the garlic butter. Mash roughly so the potatoes are just broken up. Stir in some chopped chives and season well.