Step 1

Heat olive oil in a large saucepan over medium-high heat until shimmering. Add onions, carrots, and celery and cook, stirring frequently, until softened but not browned, about 3 minutes. Add garlic and dried red pepper flakes and cook, stirring constantly until fragrant, about 1 minute. Add chicken broth, beans and their liquid, rosemary stems, parmesan rind, and bay leaves. Increase heat to high, and bring to a boil. Reduce to a bare simmer, add kale, cover and cook for 15 minutes.

Step 2

Discard the bay leaves and rosemary stems. Use a hand blender to roughly puree part of the beans until desired consistency is reached. Alternatively, transfer 2 cups of soup to a blender or food processor and process until smooth (start on low speed and increase to high to prevent blender blow-out). Return to the soup and stir to combine. Season to taste with salt and pepper.

Step 3

Ladle into bowls, sprinkle with reserved chopped rosemary leaves, drizzle with extra-virgin olive oil and a grating of Parmigiano-Reggiano, and serve with crusty toasted bread.