White Bean And Kale Soup!

I may get a few more soup recipes in before the weather warms up completely. This simple recipe could easily seem plain, but the combination of white beans and kale is a good one! Light and fresh!
White Bean and Kale Soup:*5 cups chicken stock*1/2 small sweet onion, minced*2 cloves garlic, minced*1 celery stalk, chopped fine*2 bay leaves*1 bunch fresh kale, rinsed and chopped*1-2 cups cooked white beans of your choice*sea salt and pepper*1 Tbsp butter or olive for sauteing
In a large soup pot, saute onion, celery and garlic in butter or olive oil for about 7 minutes. Add stock and bay leaves. Season with salt and pepper. Gently simmer for about 15-20 minutes, covered. Add beans. Cook a few more minutes before adding kale. Allow to wilt. Adjust seasonings. Remove from heat and serve.
*Variations- add roasted chicken for a heartier version.