Preheat the oven to 200C/gas 6/fan 180C. Tip the potatoes into a roasting tin and toss in the oil. Sprinkle with paprika and roast for 35-45 minutes until crisp and golden, shaking the tin halfway through.
Sprinkle the potatoes with salt and tip on to a platter. Spoon the crème fraîche into a small bowl and swirl the chilli sauce on top. Serve with the potatoes for dipping.