Mix the yoghurt with the chopped garlic, salt and pepper. Rub the mix all ovet the chicken and refrigerate it for at least 30 min.
Pre-heat the oven at 180 C.
Peel the potatoes and cut them into cubes. Grease an oven dish and add the potatoes. drizzle with oil, salt, pepper and rosemary. Mix it well until all potatoes are covered in oil.
Bake the potatos and the chicken in the oven for 45 min.