After the cauliflower is fully cooked you are going to add the rest of your broth, cream, hot pepper sauce and of course your sprig of thyme, salt, and pepper.
After all your flavors have mingled, you are, first going to remove the sprig of thyme. If you have an immersion blender you are going to use it on your concoction and work it into a creamed soup. Otherwise, you are going to use your regular blender. I would suggest to blend it in two or three batches and place it back in the saucepan.
Add back the sprig of thyme. Bring it to a simmer so all the flavors come together
Lastly, you are going to remove the sprig of tyme.
You can serve your soup with a dollop of sour cream and a sprinkle of cayenne.