Clean, wash and halve the mushrooms. Peel and chop the onion. Wash and halve the tomatoes
Heat the oil in a coated pan. Fry the mushrooms and onion for about 5 minutes. Add tomatoes and crème légère. Season with thyme, salt and pepper
Halve the rolls and place them on a baking tray lined with baking paper. Spread mushroom mixture on top and sprinkle with cheese. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 10-12 minutes. Sprinkle with pepper and garnish