Peel, wash and cut the potatoes into eighths. Cover and cook in salted water for about 15 minutes. Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Peel onions and cut into slices.
Peel and coarsely chop the garlic. Wash and halve the tomatoes. Wash the rosemary, shake dry and pluck the needles from the twigs.
Mix tomatoes, onions, garlic, rosemary, salt, pepper and 3 tablespoons of olive oil. Spread on one half of a baking tray. Mix crème fraîche and parmesan. Drain potatoes and spread on the other half of a baking tray.
Spread cheese cream and butter in flakes on top. Bake together in a hot oven for about 15 minutes.
In the meantime, mix soy sauce and honey. Wash the chicken, dab dry and cut into 3 pieces. Heat the remaining oil in a large pan. Fry the meat for 8-10 minutes while turning.
Season with salt and pepper. At the end of the cooking time, brush the skin side with the soy marinade and fry briefly. Serve the potatoes and vegetables from the tray with chicken pieces.