Step 1: Heat the olive oil in a large Dutch oven or heavy-bottomed pot over medium heat. Add the chopped onion, carrots, and celery. Sauté for 8-10 minutes, or until the vegetables are softened and the onion is translucent. Don't rush this step, as it builds the base flavor for your white bean soup.
Step 2: Add the minced garlic, dried oregano, and dried thyme to the pot. Cook for another 1-2 minutes until fragrant, stirring constantly to prevent the garlic from burning. This step enhances the aromatic profile of your white bean soup.
Step 3: Pour in the vegetable broth and add the fresh rosemary sprig and bay leaf. Bring the mixture to a gentle simmer.
Step 4: Stir in the rinsed and drained cannellini beans and the undrained diced tomatoes. Bring the soup back to a simmer, then reduce the heat to low, cover, and let it cook for at least 20-25 minutes to allow the flavors to meld. This slow simmer is crucial for delicious white bean soup recipes.
Step 5: Remove the rosemary sprig and bay leaf from the pot. Add the chopped kale, stirring it into the soup until it wilts, which should take about 3-5 minutes. If desired, you can use an immersion blender to blend about 1-2 cups of the soup to create a thicker, creamier texture, leaving some beans whole for texture.
Step 6: Season the white bean soup generously with salt and freshly ground black pepper to taste. Ladle hot soup into bowls. Garnish with fresh parsley or grated Parmesan cheese, if desired. Serve immediately with crusty bread for a complete meal. Enjoy one of the most comforting white bean soup recipes!