Creamy Cauliflower & Mushroom Soup

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A velvety keto soup made with puréed cauliflower and mushrooms, enriched with heavy cream and thyme. This american-inspired soups (keto, low carb) ready in about 40 minutes pairs Cauliflower florets, Cremini mushrooms, Yellow onion for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 25 min Serves 4 American cuisine 320 cal/serving
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Ingredients

Instructions

  1. Step 1: Mince 1/4 cup yellow onion and chop 1 cup cremini mushrooms. Melt 2 tbsp unsalted butter in a large pot over medium heat.
  2. Step 2: Add onions and mushrooms, sauté for 6-7 minutes until onions are translucent and mushrooms release their liquid, stirring occasionally.
  3. Step 3: Stir in 2 cups cauliflower florets and cook for 3 minutes to soften slightly.
  4. Step 4: Pour in 2 cups chicken bone broth, bring to a gentle simmer, and cook covered for 15 minutes until cauliflower is fork-tender.
  5. Step 5: Remove pot from heat and use an immersion blender to purée until completely smooth (or transfer to a blender in batches).
  6. Step 6: Return soup to low heat, stir in 1/2 cup heavy cream, 1 tbsp fresh thyme leaves, 1/2 tsp kosher salt, and 1/4 tsp black pepper. Simmer for 5 minutes until heated through and slightly thickened, stirring gently to avoid curdling.

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Frequently asked questions

How long does Creamy Cauliflower & Mushroom Soup take to make?

Total time is about 40 minutes (15 min prep + 25 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Creamy Cauliflower & Mushroom Soup?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep cauliflower florets from drying out.

Can I substitute ingredients in Creamy Cauliflower & Mushroom Soup?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Creamy Cauliflower & Mushroom Soup for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Creamy Cauliflower & Mushroom Soup keto?

Yes — this recipe is tagged keto, low carb based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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