Mushroom Leek Soup Recipe

Mushroom Leek Soup Recipe is one of those comforting bowls that feels like a warm hug on a chilly day. This creamy potato-based soup combines earthy mushrooms with mild, sweet leeks for a flavor that’s both elegant and homey. I love making this in my Instant Pot because it delivers restaurant-quality results in just 35 minutes.

I still remember the first time I made this soup on a rainy Saturday afternoon. The smell of butter-sautéed leeks and mushrooms filled my kitchen, and I knew I had stumbled onto something special. This Mushroom Leek Soup has become my go-to comfort food when I need something warm and satisfying without spending hours at the stove. The potatoes create a naturally creamy texture, while the chicken broth adds depth that makes every spoonful incredibly satisfying. It’s a simple recipe that tastes like you spent all day cooking.

What You’ll Need for This Creamy Mushroom Leek Soup

I always use fresh leeks for this recipe because they add a delicate onion-like flavor that dried alternatives just can’t match. Pro tip: slice the leeks first, then rinse them thoroughly in a colander under cold water since they trap dirt between their layers.

• 5 tablespoons butter (unsalted or salted works)
• 8 oz mushrooms, sliced (I prefer baby bella, but white button works great)
• 3 medium leeks, sliced and washed thoroughly
• 2 carrots, peeled and grated
• 1 celery stalk, chopped into small pieces
• 6 cups chicken broth (homemade is best, but quality store-bought works)
• 5 medium potatoes, peeled and cubed into 1-inch pieces
• 1 teaspoon salt (adjust to taste)
• ½ teaspoon black pepper (adjust to taste)
• ½ teaspoon dried thyme
• 1 bay leaf (optional but adds wonderful depth)
• Fresh parsley for garnish (optional)

I recommend using Yukon Gold potatoes for their naturally buttery flavor, though russets work if that’s what you have on hand. For an extra flavor boost, substitute half the mushrooms with shiitake varieties. You’ll need a 6-quart Instant Pot for this recipe.

How to Make Mushroom Leek Soup in Your Instant Pot

I prefer the Instant Pot method for this recipe because the pressure cooking melds all the flavors beautifully while keeping the vegetables tender but not mushy.

Step 1: Turn your Instant Pot to sauté mode and wait until the display reads “Hot.” Add the butter and let it melt completely, then add the sliced mushrooms. Sauté for 3 minutes, stirring every 45 seconds or so. You’ll notice the mushrooms releasing their moisture and starting to brown slightly around the edges.

Step 2: Add the leeks, grated carrots, and chopped celery to the pot. Sauté for 7 minutes, stirring occasionally. The leeks should become soft and translucent with a sweet aroma, and the mixture will smell amazing. Don’t rush this step because it builds the flavor foundation for your soup.

Step 3: Add the cubed potatoes, chicken broth, bay leaf, thyme, salt, and pepper. Stir everything together to combine. The liquid should just cover the vegetables.

Step 4: Secure the Instant Pot lid and move the steam release handle to the sealing position. Select the soup/broth function and set the timer for 10 minutes. The pot will take about 8-10 minutes to come to pressure before the cooking time begins, so factor this into your total cooking time.

Step 5: When the cooking cycle completes, carefully turn the steam release handle to venting for a quick pressure release. Wait until all the steam has escaped and the float valve (the small metal pin on the lid) drops down before opening the lid.

Step 6: Remove the bay leaf and give the soup a good stir. The potatoes should be fork-tender and the soup will have a naturally creamy, slightly chunky texture. Taste and adjust salt and pepper as needed.

Step 7: Ladle the Mushroom Leek Soup into bowls and garnish with fresh chopped parsley. Serve immediately while hot.

Pro tip: If you prefer a smoother, creamier texture, use an immersion blender to puree half the soup, leaving some chunks for texture. If your soup seems too thick after sitting, simply stir in a bit more broth when reheating.

Perfect Pairings for Your Potato Leek Mushroom Soup

This soup pairs beautifully with crusty bread and light, fresh sides that complement its rich, earthy flavors.

Homemade Crusty Bread: A warm slice of artisan bread is perfect for dipping into this creamy soup. The crispy crust and soft interior soak up the flavorful broth beautifully.

Simple Green Salad: A light salad with mixed greens, cherry tomatoes, and vinaigrette cuts through the richness and adds freshness to your meal. It’s one of the best sides for Mushroom Leek Soup when you want balance.

Garlic Bread: Buttery garlic bread adds extra richness and makes this soup feel like a special occasion meal, even on a weeknight.

Roasted Brussels Sprouts: The caramelized, nutty flavor of roasted Brussels sprouts pairs wonderfully with the earthy mushrooms in this soup.

Grilled Cheese Sandwich: Turn this into a classic comfort food combo by serving your soup alongside a crispy, melty grilled cheese for dipping.

Complete Your Soup Collection with These Favorites

This creamy mushroom leek soup complements a variety of other vegetable-forward soups that bring different flavors to the table. The light, refreshing Carrot and Celery Soup offers a bright contrast with its Italian herbs and lemon juice, making it perfect for pairing with this rich, earthy mushroom soup when serving multiple courses.

For additional protein-packed options, consider the hearty Vegan Sweet Potato Coconut Lentil Stew with its warming spices and creamy coconut base, or the comforting Vegan Red Lentil Tomato Soup that brings Italian-inspired flavors to the table. The traditional Greek White Bean Soup also pairs wonderfully, offering Mediterranean flavors with garlic and lemon that complement the mild sweetness of the leeks beautifully.

Storing Your Leftover Leek and Mushroom Soup

This soup stores beautifully, making it perfect for meal prep or enjoying leftovers throughout the week. I recommend letting the soup cool to room temperature before transferring it to airtight containers. It will keep in the refrigerator for 3-4 days and actually tastes even better the next day as the flavors continue to develop.

To reheat, simply warm it on the stovetop over medium heat, stirring occasionally until heated through. You can also microwave individual portions in 1-minute intervals, stirring between each interval. If the soup thickens too much during storage, add a splash of chicken broth or water when reheating.

Pro tip: This Mushroom Leek Soup freezes wonderfully for up to 2-3 months. Freeze in portion-sized containers for easy weeknight meals. Thaw overnight in the refrigerator before reheating.

Common Questions About Making Mushroom Leek Soup

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