Best-Ever Cauliflower Soup

In a large pot over medium heat, heat oil. Add onion and cook until soft, 6 minutes. Add garlic and cook until fragrant, 1 minute. Add cauliflower, stock, thyme, and the bay leaf and bring up to a simmer. Cook until cauliflower is very tender, 15 to 20 minutes.  When vegetables are tender, remove thyme and bay leaf and discard. Blend with immersion blender or transfer to a blender in batches and blend until smooth. Stir in cream and reheat if needed. Garnish with a drizzle of olive oil and fresh thyme and serve immediately.