Wash the potatoes. Cover and cook for about 20 minutes. Quench, peel and let cool.
Clean and wash the mushrooms and, depending on size, cut them in half or quarters. Peel and halve onions and cut them into rings. Peel garlic and press through. Cut potatoes into pieces.
Heat 4 tablespoons of oil in a large frying pan. Fry the potatoes in it in portions until golden brown. Season with salt, pepper and paprika. Distribute on the fat pan. Continue roasting in a hot oven (electric cooker: 200 °C/recirculating air: 175 °C/gas: level 3) for 5-10 minutes.
Heat 2 tablespoons of oil in a frying pan. Fry the mushrooms, onions and garlic in it. Season with salt and pepper. Mix into the potatoes. Roast everything in the oven for about 10 more minutes.
Wash the chives, chop finely and put something aside for garnishing. Mix the rest of the chives with the quark and yoghurt. Season to taste with salt and pepper. Serve with the roast potatoes. Sprinkle with remaining chives.