Cheesy Cauliflower Soup

Deselect All

4 thin slices bacon, cut into small bits

1 white onion, finely diced 

1 head cauliflower, broken into small florets 

1/2 teaspoon Cajun spice, or more to taste 

Kosher salt and freshly ground black pepper

8 cups (2 quarts) low-sodium chicken broth 

4 tablespoons (1/2 stick) butter 

1/4 cup all-purpose flour 

2 cups whole milk 

1 cup half-and-half 

3 cups grated Monterey Jack cheese, plus more for serving 

1/4 cup sour cream 

2 tablespoons minced fresh parsley, plus more for serving