Roasted Squash Soup with Carrots, Miso and Porcini

If you’re looking for a soup that’s as easy to make as it is healthy, this Roasted Butternut Squash Soup has you covered. 

Not only is this dish incredibly flavourful, but it’s also packed with nutrients and entirely plant-based. This is the kind of cosy, seasonal dish you’ll want to enjoy all pumpkin season long!

Roasted Squash Soup served in 2 bowls surrounded by bread, seeds and coriander

About this recipe

I absolutely love soups this time of year, especially when London feels cold and dark—it’s like wrapping yourself in a cozy blanket.

This recipe works because roasting the squash, carrots, onion, and garlic brings out their natural sweetness, while the miso and porcini mushrooms add a rich, savory depth. The warm spices and umami-packed ingredients make each spoonful cozy and comforting—perfect for cold evenings.

It’s super simple to make: chop, roast, blend, and enjoy! With minimal effort and big flavour, it’s an easy way to whip up a satisfying, wholesome meal. If your blender is large, you can serve the soup straight from it. My blender is small, so I usually transfer it to a pot, add more stock, and simmer until it reaches the perfect consistency.

I love to top this soup with a swirl of homemade soy yogurt for a tangy twist—any sour cream or unsweetened yogurt works well. A drizzle of good balsamic vinegar adds a touch of acidity to balance the soup’s richness. For the finishing touch, I sprinkle cayenne pepper, roasted seeds, and fresh herbs like Coriander, Parsley, or Dill.

Serve it with a slice of my homemade gluten free Buckwheat Bread.

This is a go-to recipe in my house during this time of year, and we can’t get enough of it. I hope you give it a try and love it as much as we do!

Roasted Squash Soup served in 2 bowls surrounded by bread, seeds and coriander

Ingredients:

  • 1 Butternut Squash (around 1 kg)

  • 1 Red medium Onion

  • 2 Carrots

  • 4-6 cloves of Garlic

  • 1/2 Tbsp of olive Oil (optional)

  • 1-2 Tbsp of Miso paste

  • 3 gr of dry Porcini Mushrooms

  • 1/2 tsp of freshly cracked Black Pepper

  • 1/4 tsp of Turmeric

  • 1/4 tsp of freshly grated Nutmeg

  • 1 pinch of Cayenne pepper (optional)

  • 800 ml of the water from the dry Porcini (more if needed)

Toppings/Garnish:

  • 1 tsp of roasted Pumpkin seeds
  • 1 tsp of Sunflower seeds
  • 1 Tbsp of chopped Coriander or Parsley
  • 1 Tbsp of Yogurt, Sour cream or Oat cream
Ingredients for a Butternut squash soup lay flat

About this Ingredients:

Butternut Squash: Any variety of pumpkin or squash works well for this recipe. If your squash is too tough to cut, rinse it with warm water or microwave it for 1 minute to soften. Butternut squash becomes wonderfully sweet and caramelized when roasted, developing a smooth, velvety texture.

Red Onion: While you can substitute with white or yellow onions, I prefer red onion for its higher nutrient content and ability to enhance the dish’s rich color. Roasting red onions brings out their mild sweetness and savory flavor, which turns delightfully umami-rich.

Garlic: Roasted garlic is pure magic! Its sharp, pungent bite transforms into a mellow, buttery sweetness that melts in your mouth. Each clove becomes soft and caramelized, releasing a rich, nutty flavor that’s both savory and subtly sweet. It’s the perfect ingredient to elevate this soup to a gourmet level with its depth and complexity.

Carrots: Roasted carrots are a delightful balance of natural sweetness and earthy depth. The high heat caramelizes their natural sugars, giving them a subtly smoky, almost honey-like flavor. Their tender texture and slight nuttiness make them the perfect complement to savory dishes, adding warmth and a hint of brightness to our soup.

Dry Porcini Mushrooms: Dry porcini mushrooms are the secret to adding a rich, earthy depth and incredible umami flavor to this soup. Their concentrated flavor elevates the dish, making it taste more complex and satisfying, while the soaking water infuses the broth with even more savory goodness. If you don’t have it use vegetable stock instead.

Pouring butternut squash soup into 2 bowls, surrounded by bread slices, seeds and herbs

Miso Paste: Miso adds umami, saltiness, and a touch of sweetness from fermentation. It’s healthier than salt and great for gut health.

Turmeric and Black Pepper: I’m using turmeric in this recipe not only for its vibrant color but also for its anti-inflammatory properties and earthy flavour. When paired with black pepper, the absorption of curcumin (the active compound in turmeric) is greatly enhanced, making it a powerful addition to boost both flavor and health benefits. The combination adds a warm, aromatic layer that perfectly complements the sweetness of the squash and the umami of the mushrooms.

Instructions step by step:

Step 1Prepare the Butternut Squash.

Thoroughly wash the squash under running water to remove any dirt. If the squash is hard to cut, microwave it for 1 minute to soften it slightly. Place it on a stable surface and, using a sharp knife, carefully slice it lengthwise down the middle. Scoop out the seeds and stringy pulp with a spoon.

carrots being cut lengthwise

Step 2 Prepare the Carrots.

Preheat the oven to 180°C (355°F) with the fan on. Wash the carrots thoroughly under running water. Slice them lengthwise in half, then cut them into halves or quarters, depending on their size, to ensure even roasting.

Step 3 – Prepare the Onion and Garlic.

Halve the red onion, peel it, and slice it into thin half-moons (around 12 slices). For the garlic cloves, simply trim off the ends—there’s no need to peel them for roasting.

Butternut Squash, carrots, garlic and red onion on a oven tray

Step 4 – Season and Roast.

Arrange the deseeded squash, sliced carrots, and onion half-moons on a baking tray. Place the garlic cloves inside the hollow of the squash. Drizzle with 1/2 tablespoon of olive oil and season with black pepper to taste. Flip the squash flesh-side down, ensuring the garlic stays in place. Roast in the oven for 40–50 minutes.

Pouring boiling water into a jar with dry Porcini Mushrooms

Step 5 – Prepare the Porcini Broth.

While the vegetables are roasting, pour 1 liter of boiling water over the dried porcini mushrooms in a bowl. Let them soak for at least 30 minutes to release their rich, earthy flavour.

Butternut squash, carrots and red onions on a oven tray

Step 6 – Remove the Onions.

Halfway through baking (around 20 minutes), or once the red onions turn golden brown, remove them from the oven. Onions cook faster than the other vegetables and can burn easily, so keep a close eye on them.

Roasted Butternut Squash, carrots and Onions.

Step 7 – Scooping Butternut Squash Flesh.

Allow the roasted butternut squash to cool slightly, then use a spoon to scoop the soft flesh away from the skin. Discard the skin and set the flesh aside for blending.

Roasted squash, red onion, carrots and garlic in a blender glass jar

Step 8 – Blend.

Transfer the roasted butternut squash flesh, onions, carrots, miso paste, and spices into a blender. Squeeze the roasted garlic cloves out of their peels and add them to the blender. Pour in half of the porcini mushroom soaking liquid and blend until smooth and creamy.

Grating nutmeg into Butternut squash soup in a white pot.

Step 9 – Adjust Thickness and Serve.

If your blender is large enough and the soup has reached your desired thickness, you can serve it directly from the blender jar. Otherwise, pour the soup into a pot and add more stock until it reaches your preferred consistency. Stir in grated nutmeg, taste, and adjust the seasoning as needed before serving.

Roasted Squash Soup with Carrots, Miso and Porcini

Marisa Marques
If you're looking for a soup that's as easy to make as it is healthy, this Roasted Butternut Squash Soup has you covered. 
Not only is this dish incredibly flavourful, but it’s also packed with nutrients and entirely plant-based.
It’s super simple to make: chop, roast, blend, and enjoy! With minimal effort and big flavor, it’s an easy way to whip up a satisfying, wholesome meal.
Prep Time 5 minutes
Cook Time 45 minutes
Blend 5 minutes
Total Time 55 minutes
Course Main Course, Soup, Starter
Cuisine Mediterranean
Servings 4 people
Calories 220 kcal

Equipment

  • 1 Roasting tray
  • 1 blender

Ingredients
  

  • 1 Butternut Squash around 1 kg
  • 1 Red medium Onion
  • 2 Carrots
  • 4-6 cloves of Garlic
  • 1/2 Tbsp of Olive Oil optional
  • 1-2 Tbsp of Miso paste
  • 3-5 gr of dry Porcini Mushrooms
  • 1/2 tsp of freshly cracked Black Pepper
  • 1/4 tsp of Turmeric
  • 1/4 tsp of freshly grated Nutmeg
  • 1 pinch of Cayenne pepper optional
  • 800 ml of the water from the dry Porcini more if needed

Topping/Garnish (optional)

  • 1 tsp of roasted Pumpkin seeds
  • 1 tsp of Sunflower seeds
  • 1 Tbsp of chopped Coriander or Parsley
  • 1 Tbsp of Yogurt Sour cream or Oat cream

Instructions
 

  • Prepare the Butternut Squash.
    Thoroughly wash the squash under running water to remove any dirt. If the squash is hard to cut, microwave it for 1 minute to soften it slightly. Place it on a stable surface and, using a sharp knife, carefully slice it lengthwise down the middle. Scoop out the seeds and stringy pulp with a spoon.
  • Prepare the Carrots.
    Preheat the oven to 180°C (355°F) with the fan on. Wash the carrots thoroughly under running water. Slice them lengthwise in half, then cut them into halves or quarters, depending on their size, to ensure even roasting.
  • Prepare the Onion and Garlic.
    Halve the red onion, peel it, and slice it into thin half-moons (around 12 slices). For the garlic cloves, simply trim off the ends—there’s no need to peel them for roasting.
  • Season and Roast.
    Arrange the deseeded squash, sliced carrots, and onion half-moons on a baking tray. Place the garlic cloves inside the hollow of the squash. Drizzle with 1/2 tablespoon of olive oil and season with black pepper to taste. Flip the squash flesh-side down, ensuring the garlic stays in place. Roast in the oven for 40–50 minutes.
  • Prepare the Porcini Broth.
    While the vegetables are roasting, pour 1 liter of boiling water over the dried porcini mushrooms in a bowl. Let them soak for at least 30 minutes to release their rich, earthy flavour.
  • Remove the Onions.
    Halfway through baking (around 20 minutes), or once the red onions turn golden brown, remove them from the oven. Onions cook faster than the other vegetables and can burn easily, so keep a close eye on them.
  • Scooping Butternut Squash Flesh.
    Allow the roasted butternut squash to cool slightly, then use a spoon to scoop the soft flesh away from the skin. Discard the skin and set the flesh aside for blending.
  • Blend.
    Transfer the roasted butternut squash flesh, onions, carrots, miso paste, and spices into a blender. Squeeze the roasted garlic cloves out of their peels and add them to the blender. Pour in half of the porcini mushroom soaking liquid and blend until smooth and creamy.
  • Adjust Thickness and Serve.
    If your blender is large enough and the soup has reached your desired thickness, you can serve it directly from the blender jar. Otherwise, pour the soup into a pot and add more stock until it reaches your preferred consistency. Stir in grated nutmeg, taste, and adjust the seasoning as needed before serving.

Notes

It keeps well in the fridge for 4–5 days and can be frozen for up to 4 months.
If you don’t have dried porcini mushrooms, simply substitute with vegetable stock or water.

Did you make this recipe?

Please tag us on @fromplantswithlovekitchen

There are no reviews yet. Be the first one to write one.