Clean and wash the spinach, cook in boiling salted water for about 2 minutes and drain. Peel garlic and chop very finely. Wash the thyme and rosemary, dab dry and pluck the leaves from the stalks.
Heat two tablespoons of olive oil in a pan, add herbs and garlic and fry the slices of bread in it from both sides. Wash, clean and slice the tomatoes. Cut the mozzarella into slices.
Cut olives into slices. Place slices of bread on a baking tray lined with baking paper and cover with spinach, tomatoes, olives and mozzarella. Drizzle with the remaining oil. Bake the bread in a preheated oven (electric: 200 °C/ gas: level 3) for 12-15 minutes.
Serve on a plate and garnish with rosemary as desired.