Cream of Broccoli-Kale Soup

4 tablespoons butter
1-2 scallions or 1/2 onion chopped
1 small head broccoli, chopped
1/2 bunch kale, midribs removed and leaves chopped
2-4 cups of chicken broth
sour cream
salt and pepper

In sauce pan, heat butter on medium.  Saute onion/scallion stirring until translucent, about 5-7 minutes.  Add broccoli, kale and chicken broth.  Bring to boil, turn down and simmer 20-30 minutes or until kale is tender.  Puree, season with salt and pepper.  Ladle into bowls and add a dollop of sour cream to each bowl.  Serve.