02Using an immersion blender, puree the soup; leave it coarse and chunky if you prefer a more rustic soup, or puree until smooth for a more elegant soup. Add the cheese, about 1/3 cup at a time, stirring after each addition until melted and smooth. Taste and adjust for seasoning with salt and pepper.03To serve, ladle the soup into warmed bowls. Sprinkle with chives and serve immediately.