The zucchini is emptied of seeds and ribs and cut into medium squares.
Peel the potatoes, onion and garlic.
Put everything to boil in a miracle pot in a larger amount of water for 20-30 minutes.
Strain everything, keeping the water in which it boiled.
Remove the bay leaf and mix by adding water gradually until a cream is obtained.
Add sour cream and optionally 3 cubes of melted cheese. Mix.
Season with salt and freshly ground pepper.
Serve hot with thin slices of bread or croutons.