Blackened Cauliflower Soup

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Roasted cauliflower blends up with a touch of coconut milk to make the creamiest, dreamiest, and totally dairy-free soup. Oh, and this vegan cauliflower soup gets an extra flavor punch from Cajun blackening spices!

This one is a new favorite! I never thought my favorite soup would be made of cauliflower. I never thought my favorite anything would be made of cauliflower.

I had a tough time getting down with cauliflower for a while. You know those frozen bags of mixed veggies that have some combination along the lines of peas, carrots and cauliflower? They kind of ruined cauliflower for me. The cauliflower was always the blandest, soggiest part of the mix, and for a long time that was the extent of my cauliflower experience. It made me think I just didn’t like the stuff.

It wasn’t until I started blogging that I started playing around with cauliflower in my kitchen. And wow, I loved it!

When it comes to making cauliflower delicious, roasting is the way to go. I actually had a hard time putting the roasted cauliflower for this recipe into soup. I could’ve eaten it all straight from the skillet. (Hint: if you’re looking for a show stealing side dish, just roast some cauliflower with blackening seasoning as instructed in this recipe.)

To make this soup you’ll be roasting some cauliflower, onions and garlic all at once. I always get a few questions when I post a recipe calling for a whole head of roasted garlic, so to address that in advance: the amount is correct! Roasting the garlic mellows the flavor so much you could eat the garlic straight with a fork. So a whole head isn’t really that much when you roast it.

The cauliflower and onion get sprinkled with blackening seasoning before roasting. I like to make my own, since I generally have all the requisite spices on hand, but feel free to use a commercial blackening seasoning if you prefer.

Drizzle the veggies with olive oil, toss with spices, and roast away.

Once the cauliflower, onion and garlic are done roasting, into the soup they go for a brief simmer.

You can then blend everything up until it’s nice and creamy. I used an immersion blender, but a food processor or regular blender works just as well.

I like my creamy soups with toppings. Pile on the hot sauce, scallions, parsley, or whatever else you like.

Tips for Making Perfect Blackened Cauliflower Soup…

  • If you decide to use a commercial blackening seasoning, be sure to check if it contains salt. Some do, and some don’t. If yours does, consider using low sodium broth to ensure the soup doesn’t get overly salty.
  • Store-bought blackening seasonings also vary quite a bit in heat level. If you’re not into super spicy food, you’d be best to make it yourself, and go easy on the cayenne.
  • I like my soup nice and thick, so I only used 3 cups of broth in the batch you see in the photos. Use more (or less) if you prefer.

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5 from 2 votes Print

Blackened Cauliflower Soup

Roasted cauliflower blends up with a touch of coconut milk to make the creamiest, dreamiest, and totally dairy-free soup. Oh, and this vegan cauliflower soup gets an extra flavor punch from Cajun blackening spices!

CourseSoup CuisineAmerican Prep Time 15 minutes Cook Time 50 minutes Total Time 1 hour 5 minutes Servings 4 Calories 316 kcal Author Alissa


  • 1medium garlic bulb
  • 2tablespoonsolive oildivided
  • 1large cauliflower crown,leaves removed, chopped into 1-2 inch pieces
  • 1 ½tablespoonsblackening seasoning,store bought or homemade
  • 1large onion,peeled and quartered
  • 3-5cupsvegetable broth
  • 1cupcanned coconut milk
  • 2teaspoonswhite wine vinegar
  • Salt to taste
  • Toppings of choice (hot sauce, scallions, parsley)


  1. Preheat the oven to 425°F.

  2. Cut the top off of the garlic bulb. Drizzle with 1 tablespoon olive oil and loosely wrap in foil.

  3. Toss the cauliflower and onion pieces with 1 tablespoon olive oil and blackening seasoning. Arrange in a single layer on a baking sheet, or in a roasting pan or oven-safe skillet.

  4. Place everything into the oven to roast, tossing the cauliflower every 15 minutes or so. 

  5. Remove the cauliflower and onion from the oven when they become very tender (about 30-35 minutes), and remove the garlic when the cloves are browned and very soft (about 40-45 minutes). Allow everything to cool for a few minutes.

  6. Once the veggies are cool enough to handle, transfer them to a large pot. You’ll need to squeeze the garlic bulb to extract the roasted cloves. 

  7. Add 3 cups of broth and coconut milk to the pot and place it over high heat. Bring the liquid to a boil, lower heat and simmer for about 5 minutes, until the cauliflower nearly falls apart when stabbed with a fork.

  8. Blend the mixture with an immersion blender, or carefully transfer it in batches to a food processor or blender to blend, then return it to the pot.

  9. Thin the soup with additional broth if desired. Stir in the white wine vinegar and season with salt to taste. Reheat on the stove if needed.

  10. Ladle into bowls and serve with toppings of choice.

Nutrition FactsBlackened Cauliflower SoupAmount Per ServingCalories 316Calories from Fat 208% Daily Value*Fat 23.1g36%Saturated Fat 14.1g71%Sodium 1129mg47%Potassium 1093mg31%Carbohydrates 21.1g7%Fiber 7.4g30%Sugar 9.3g10%Protein 11.1g22%Calcium 60mg6%Iron 2.5mg14%* Percent Daily Values are based on a 2000 calorie diet.« Crispy Beer-Battered Tofu Tacos with Vegan Baja SauceChickpea Vegan Chorizo Burgers with Green Olive Cashew Cheese »

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Hi, I’m Alissa! I’m a former attorney turned professional food blogger. I love creating vegan recipes with bold flavors!

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