Finely dice the onions. Clean the carrots and kohlrabi and cut into strips. Sauté the vegetables in a little butter until translucent and add the broth. Simmer for about 5 minutes, then remove about half of the vegetables from the broth. Puree the remaining vegetables in the broth. Melt the cream cheese in the soup over a mild heat, then add the vegetable strips again. Serve the soup sprinkled with the chopped parsley.