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Creamy roasted cauliflower soup finished with a bright squeeze of lemon juice and white wine glaze.

Creamy Roasted Cauliflower Soup

Rebecca Blumer
Experience the luxurious depth of caramelized cauliflower in this silky, bistro-style soup. Roasting the vegetables creates a nutty, toasted flavor that pairs perfectly with aromatic thyme and rich heavy cream.
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Prep Time 20 minutes
Cook Time 1 hour
Total Time 1 hour 20 minutes
Course Soup
Cuisine American
Servings 6 servings
Calories 355 kcal

Equipment

  • Roasting pan
  • Large Pot
  • Immersion Blender

Ingredients
 

  • 2 heads cauliflower, separated into florets
  • 2 shallots, chopped
  • 3 cloves garlic, chopped
  • 1 tablespoon olive oil
  • 3 cups chicken broth
  • 1 cup water
  • 1 teaspoon dried thyme
  • 1 bay leaf
  • 2 cups heavy cream
  • salt and ground black pepper to taste

Instructions
 

Roast for deep flavor

  • Heat the oven to 425 degrees F (220 degrees C) and allow it to preheat fully to ensure the cauliflower browns immediately rather than steaming.
  • In a large bowl, toss the cauliflower florets, chopped shallots, and garlic with olive oil until coated. Spread the mixture in a single layer on a rimmed baking sheet with enough space between pieces.
  • Roast for 30 minutes until the cauliflower is tender and the edges have developed deep golden, toasted spots for a nutty flavor.

Simmer the soup base

  • Transfer the roasted cauliflower mixture into a large pot. Add the chicken broth, water, dried thyme, and the bay leaf, then bring the mixture to a boil.
  • Reduce the heat to medium and simmer for 30 minutes, allowing the flavors to meld and the broth to become savory and aromatic.
  • Remove and discard the bay leaf before proceeding to the blending stage to prevent any bitter or sharp notes in the puree.

Blend and finish with cream

  • Purée the hot soup using an immersion blender until completely smooth. If using a standard blender, work in small batches and vent the lid to allow steam to escape safely.
  • Stir in the heavy cream until the soup reaches a pale, silky consistency. Season with salt and ground black pepper to taste, then warm gently without letting it boil to keep the dairy smooth.

Notes

Deglazing Secret: For extra depth, splash a bit of dry white wine onto the hot roasting pan after cooking, scrape up the browned bits (fond), and add them to your pot.
Safety Tip: When blending hot liquids in a stand blender, never fill it more than halfway and always remove the center piece of the lid to vent steam pressure safely.
Storage Tip: This soup keeps well in an airtight container for up to 4 days in the refrigerator. The flavors often deepen and improve significantly on the second day.
Nutrition information is estimated based on common ingredients and serving sizes and may vary.

Nutrition

Calories: 355kcalCarbohydrates: 13gProtein: 6gFat: 32gSaturated Fat: 20gCholesterol: 95mgSodium: 850mgPotassium: 650mgFiber: 5gSugar: 6gVitamin A: 10IUVitamin C: 90mgCalcium: 8mgIron: 6mg
Keyword creamy soup, healthy dinner, roasted cauliflower soup
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