Heat oil in a large pot. Add the onion and cook, stirring often, until the onions begin to soften. Add the carrots and celery and cook for about 5 minutes. Add the garlic and cook for another 10-15 seconds. Add tomato paste. Mix well.
Add beans, diced tomatoes, broth, thyme, and butternut squash. Sprinkle with salt and pepper. Bring to a simmer and let cook for about 20 minutes. Add the kale and let cook for another 5-10 minutes (until kale is softened).