Wash the potatoes and cook in boiling water for about 30 minutes. Wash tomatoes, dab dry, cut in half. Clean and wash spring onions and cut them diagonally into rings. Wash thyme, dab dry. Put something aside for garnishing. Pluck the remaining leaves from the stems.
Crumble the feta cheese, mix everything with olives and oil. Drain the potatoes, rinse them, cut them lengthwise and press them apart a little. Put potatoes on a baking tray and fill with the cheese mixture. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 5-10 minutes. Arrange the baked potatoes on plates and garnish with thyme