Creamy Fennel and Leek Soup

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

A velvety soup featuring tender fennel and leeks simmered with potatoes and cream for comforting, aromatic warmth. This french-inspired soups ready in about 45 minutes pairs butter, white part only, thinly sliced leek, finely diced fennel bulb for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 200 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: 30 min Serves 4 French cuisine 200 cal/serving
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Ingredients

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Instructions

  1. Step 1: Melt 2 tbsp butter in a large pot over medium heat. Add 1 sliced leek and cook for 3 minutes until softened.
  2. Step 2: Stir in 1 finely diced fennel bulb and 1 chopped onion, cooking for 5 minutes until vegetables are tender.
  3. Step 3: Add 3 minced garlic cloves and cook for 1 minute until fragrant.
  4. Step 4: Pour in 4 cups vegetable broth and add 1/2 cup diced potatoes. Bring to a simmer and cook for 15 minutes until vegetables are very soft.
  5. Step 5: Use an immersion blender to puree the soup until smooth, or transfer to a blender in batches.
  6. Step 6: Stir in 1/2 cup heavy cream and heat gently for 2 minutes without boiling. Season with salt to taste before serving.

Frequently asked questions

How long does Creamy Fennel and Leek Soup take to make?

Total time is about 45 minutes (15 min prep + 30 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 Fennel and Leek 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 butter from drying out.

Can I substitute ingredients in Creamy Fennel and Leek 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 Fennel and Leek 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.

What goes well with Creamy Fennel and Leek Soup?

French soups like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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