From America's Test Kitchen and I quote them "A garnish is essential to add crunch and flavor to this soup. We like garlic chips, but crisp bacon bits, fried leeks, or garlic croutons are good options, too. A potato masher can be used instead of an immersion blender to mash some of the potatoes right in the pot, though the consistency will not be as creamy. If leeks are not available, substitute an equal amount of yellow onion. The test kitchen prefers the soup made with chicken broth, but vegetable broth can be substituted.