Heat oven to 200C/180C fan/gas 6. Bring a large pan of salted water to the boil, add potatoes and bay leaves, bring back to the boil and simmer for 10-12 mins until just tender.
Drain the potatoes and leave to steam in a colander. Return the pan to the heat, add butter and melt gently until it turns a nutty brown colour. Remove from the heat, stir through the potatoes (don’t worry if a few break up) and bay leaves, and leave to absorb for a few mins.
Meanwhile, heat a roasting tin in the oven, tip the potatoes in and season well. Roast for 30-35 mins until golden and crisp, turning and basting halfway through. Transfer to a dish and pour over any buttery juices from the tin.