Preheat the oven to 180 - 200 ° C top / bottom heat. Grease a larger baking dish with butter.
Wash the zucchini and cut into 1 cm thick slices. Peel the potatoes and cut into thin slices with the vegetable slicer. Layer the zucchini and potatoes alternately in the form of a fan. Mix the sour cream, cream and spices and pour over the vegetables. Put the butter flakes on top and sprinkle with the parmesan.