For the carrot zucchini cream soup, cut the carrots into slices, zucchini and potato into cubes. Sauté the sliced onion in a pot with olive oil, add the sliced vegetables, the chopped garlic, cover with water and add salt and the diced vegetables.
Simmer slowly for about 20-30 minutes until the vegetables are soft (not too long, otherwise valuable vitamins will be lost).
Finely puree the cooked vegetables with a hand blender, add the cold butter and whipped cream and blend again. Season the carrot-zucchini cream soup with pepper and serve hot.