Step 1

Bring a large pot of water to a boil. Add 4 cups cauliflower. Cook until very tender, about 15 minutes.

Step 2

Drain water, and transfer cauliflower to a blender or food processor. Add milk and cheese. Puree until mostly smooth and uniform.

Step 3

Spray the empty pot with nonstick spray, and bring to medium-high heat. Cook and stir onion until mostly softened, about 4 minutes.

Step 4

Add cauliflower puree, remaining 2 cups chopped cauliflower, broth, garlic, salt, and pepper.

Step 5

Bring to a boil.

Step 6

Reduce to a simmer. Cover and cook for 15 minutes, or until cauliflower is tender.

Step 7

Meanwhile, cook bacon until crispy, either in a skillet over medium heat or on a microwave-safe plate in the microwave.

Step 8

Before serving, top each portion with 1 tbsp. each sour cream and scallions. Chop or crumble bacon, and sprinkle over each serving (about 1 tbsp. each).