Cauliflower Soup

Name: Cauliflower Soup
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American
Ingredients: 1/2 c. salted butter, divided; 1 medium onion, finely chopped; 1 carrot, finely chopped; 1 celery stalk, finely chopped; 1 head cauliflower, cut into 1-inch pieces; 2 tbsp. chopped parsley (fresh or dried); 1 qt. low-sodium chicken broth or stock; 6 tbsp. all-purpose flour; 2 c. whole milk; 1 c. half-and-half; 1 to 2 bay leaves; 1 tsp. kosher salt, plus more to taste; 1/2 tsp. black pepper, plus more to taste; 1 c. sour cream, to serve