Wash, peel and slice the potatoes. Pre-cook in boiling salted water for about 4 minutes and drain. Wash and clean the zucchini and cut them lengthwise into thin slices.
Wash, clean and slice the tomato. Cut bacon into small cubes. Grease a flat casserole dish (approx. 15x15 cm). Place potato and zucchini slices and half of the tomato slices alternately in the dish.
Add the rest of the tomato wedges and some rosemary. Pour casserole cream over the vegetables, sprinkle with cheese and diced bacon. Bake in the preheated oven (electric: 225 ° C/ gas: level 4) for 15-20 minutes.
Sprinkle with pepper.