Cut a lid off the tomatoes and set aside. Hollow out tomatoes and season with salt and pepper.
Peel the onion and garlic cloves. Chop together with thyme, oregano and parsley, then mix with the mashed sheep cheese, low-fat quark, egg and breadcrumbs to a smooth cream.
Pour the cream into the tomatoes, cover with the lids that have been put back and brush with oil. Place the stuffed tomatoes in a coated baking dish.
Cook in the preheated oven on the middle rack at 200 ° C (gas: level 3) for about 15-20 minutes. Serve hot.