In a saucepan, sauté the diced onions in butter. Then add the potatoes cut into cubes. Pour in the vegetable stock and cook covered for about 15 minutes.
Wash and clean the beans (canned beans also do very well) and cut into small pieces.
Puree the potatoes in the broth and add the cream. Add the beans and cook everything at a mild temperature for 15 minutes. Salt and pepper.
Finally, cut the bacon into cubes, fry and sprinkle the soup with it.