Potato Leek Soup Recipe

I published this potato leek soup recipe a few years ago after a particularly rainy fall day. My garden was overflowing with leeks, and I needed a hug in a bowl.

I had tried many versions before, but they always felt a bit thin or one-note. I wanted something with a velvety texture and a deep, sweet flavor that felt like a warm blanket.

My secret for this recipe isn’t a fancy ingredient. It’s a simple technique I learned from making mashed potatoes. It makes the soup unbelievably creamy without needing to add a ton of heavy cream. It’s a game-changer.

Recipe Overview

• Cuisine: American/French
• Category: Soup
• Prep Time: 15 minutes
• Cook Time: 35 minutes
• Total Time: 50 minutes
• Servings: 4-6

Why This Recipe is So Special

What makes this soup stand out is the way we build the flavor. We start by cooking the leeks slowly in butter until they practically melt.

This step, called sweating, brings out their natural sweetness. It’s the flavor foundation for the whole pot.

Then, instead of just blending it all, we reserve some of the cooked potatoes. We mash them and stir them back in at the end.

This gives the soup a wonderfully hearty and creamy body. It feels substantial and comforting in every single spoonful.

The Full Ingredient List

This is my go-to list for a perfect, balanced soup. Every item has a job to do, from building flavor to creating that dreamy texture.

• 3 tablespoons unsalted butter
• 3 large leeks (white and light green parts only), cleaned and sliced
• 3 cloves garlic, minced
• 1.5 lbs Yukon Gold potatoes, peeled and cubed
• 4 cups vegetable broth
• 1 bay leaf
• 1 teaspoon fresh thyme leaves (or 1/2 tsp dried)
• 1/2 cup heavy cream or half-and-half
• Salt and freshly ground black pepper to taste
• Chopped fresh chives or parsley, for garnish

My Step-by-Step Method

Follow these steps and you’ll have a pot of pure comfort food magic. I promise it’s easier than you think!

1. Clean your leeks well. Slice them lengthwise and rinse under cold water to remove any grit hiding between the layers. Then, slice them thinly.
2. In a large pot or Dutch oven, melt the butter over medium-low heat. Add the sliced leeks and a pinch of salt. Cook, stirring now and then, for about 15 minutes. You want them soft and sweet, not browned.
3. Add the minced garlic and cook for just one more minute until it smells amazing.
4. Add the cubed potatoes, vegetable broth, bay leaf, and thyme. Bring everything to a boil.
5. Once boiling, reduce the heat to a simmer. Cover the pot and let it cook for 20-25 minutes, until the potatoes are completely tender.
6. Remove the bay leaf. Carefully use a slotted spoon to take out about 1 cup of the cooked potato chunks. Set them aside in a bowl.
7. Use an immersion blender to puree the soup right in the pot until it’s smooth. If you use a regular blender, let the soup cool a bit first and blend in batches.
8. Mash the reserved potato chunks with a fork until mostly smooth. Stir this mashed potato back into the pureed soup. This is the secret for a creamy, thick texture!
9. Stir in the heavy cream. Warm the soup through on low heat. Do not let it boil after adding the cream. Season generously with salt and pepper.
10. Ladle into bowls and top with fresh chives, parsley, and a crack of black pepper.

My Top Tips for Success

• Clean Leeks Thoroughly: Grit ruins soup! After slicing, swish the leeks in a bowl of cold water. The sand will sink to the bottom.
• Low and Slow for Leeks: Don’t rush the first step. Cooking leeks slowly in butter is what gives this soup its incredible, sweet base flavor.
• Reserve and Mash Potatoes: Do not skip reserving some potatoes to mash. It makes the texture perfect and gives the soup a lovely homemade feel.
• Season at the End: Broths vary in saltiness. Always do your final seasoning with salt and pepper after you’ve added the cream and mashed potatoes.

Common Mistakes to Avoid

I’ve made these mistakes so you don’t have to! Here’s how to steer clear of common soup pitfalls.

Not cleaning leeks properly. There is always dirt trapped inside. If you skip washing them, you’ll have gritty soup. Take the extra minute to rinse them well.

Blending all the potatoes. If you blend every single potato chunk, the soup can become a bit gluey or too thin. The mashed potato trick gives you control over the final thickness.

Boiling after adding cream. If you let the soup boil once the cream is in, it can sometimes separate or look a little curdled. Just warm it gently on low heat.

NUTRITION INFORMATION

• Calories: 280
• Carbohydrates: 35g
• Protein: 4g
• Fat: 14g
• Saturated Fat: 9g
• Cholesterol: 40mg
• Sodium: 650mg
• Fiber: 4g
• Sugar: 5g

*Nutrition is an estimate for one serving.

FREQUENTLY ASKED QUESTIONS

Can I make this soup ahead of time?

Absolutely! This soup is a fantastic make-ahead meal. Let it cool completely and store it in the fridge for up to 3 days. It will thicken as it sits, so just thin it with a little broth or water when you reheat it.

Can I freeze potato leek soup?

You can, but with a note. Cream-based soups can sometimes separate when frozen and thawed. For best results, freeze the soup before you add the cream. Thaw, reheat, and then stir in the fresh cream.

What’s the best potato to use?

I swear by Yukon Gold potatoes. They have a naturally buttery flavor and a creamy texture when cooked, which is perfect for soup. Russet potatoes will also work, but the texture will be a bit more fluffy and starchy.

Leave a Reply! (I’d Love to Hear From You!)

Did you try my mashed potato trick in your soup? I want to know how it turned out for you! Tell me all about it in the comments below. Did you add any personal twists? Your notes and star ratings help other home cooks find their new favorite recipe. Happy cooking, friends!