Mix the breadcrumbs, parsley and 2 tablespoons of cheese.
Peel the garlic. In a blender, mix feta, sour cream, garlic and the remaining cheese.
Preheat the oven to 180 degrees. Cut the zucchini into thin circles and put it in a baking dish, season with salt and pepper. Pour over the sauce and sprinkle with powdered sugar. Bake for about 40 minutes (focus on your oven) until golden brown.