Peel and finely chop the garlic. Wash potatoes thoroughly and cut in half. Bring cream, garlic and herbs of Provence to the boil in a small pot. Season with nutmeg, salt and pepper.
Place the potatoes in an ovenproof dish and pour the cream over them. Sprinkle with cheese and bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 30-35 minutes. In the meantime, wash the thyme, dab dry and remove the leaves from the stems.
Sprinkle the casserole with thyme and garnish as desired with basil and sage and serve.