Cauliflower Soup

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1 stick butter

1/2 onion, finely diced

1 carrot, finely diced

1 celery stalk, finely diced

1 cauliflower head, cored and roughly chopped

2 tablespoons finely minced fresh parsley

8 cups low-sodium chicken broth or stock

6 tablespoons all-purpose flour

2 cups whole milk

1 cup half-and-half

1 to 2 teaspoons salt (or to taste)

Ground black pepper

1 heaping cup sour cream, at room temperature

Warm rolls or crusty bread, for serving