Chop the broccoli, potatoes and carrots into small pieces.Pour the water into a pot on heat and add the cube of soup, then add the vegetables, let them cook for 10 minutes, on medium heat.
When the vegetables are soft, blend the mixture with a hand blender. You need to get a thick and smooth creamy structure.
Then put the olive oil in a pan on the fire to heat, then add the garlic and fry for 1 minute, then pour the heated oil into the soup and mix well. Finally add salt, pepper and parsley if desired. Remove the soup from the heat and wait for it to cool a bit, then add the yogurt and mix well.Serve the soup hot.