Kabocha Squash Soup

Name: Kabocha Squash Soup
Prep time: 20 min
Cook time: 45 min
Total time: 65 min
Ingredients: 1 small to medium-sized cauliflower; ½ large kabocha squash (or a small onion squash or a chunk of Crown Prince); 1 large onion (roughly chopped); 1 head garlic; 2 tablespoons roughly chopped sage ((plus a few finely ribboned leaves to finish)); 2 tablespoons olive or vegetable oil; 1 liter veggie stock (hot or warm); 1 teaspoon salt; 1 teaspoon black pepper

Kabocha squash soup is warm, cozy, and perfect for chilly days. This type of squash is naturally sweet and extra creamy, which makes it amazing for soup. Roasting the vegetables brings out deeper flavor and gives the soup a rich, comforting taste. It’s simple enough for a weeknight but still feels a little special.

You’ll find helpful tips here to make the soup smooth, flavorful, and easy from start to finish. The steps are relaxed and beginner-friendly, with plenty of room to adjust things to your taste. You can blend it super creamy or keep it a bit rustic. It’s a great recipe to enjoy right away or save for leftovers later in the week.

For even more squash-y goodness, try these sweet Delicata squash salad, air-fryer spaghetti squash, and herby Kabocha squash recipes!

Table of Contents

Why You Must Make This Cozy Soup

This simple squash bisque recipe is cozy, creamy, and full of comforting flavor. It’s easy to make, flexible with ingredients, and perfect for a warm, satisfying meal any day of the week. Here are more reasons to try this kabocha squash soup:

Naturally Creamy Without Fuss. Kabocha squash has a thick, creamy texture all on its own. Once blended, the soup feels rich and smooth.
Sweet and Savory Flavor. This winter squash has a gentle sweetness and roasting brings out deeper, nuttier notes. Every spoonful tastes warm and comforting.
Roasting Makes It Extra Good. Roasted veggies add big flavor with very little effort. The caramelized edges make the soup taste richer.
Perfect for Make-Ahead Meals. This soup tastes great the next day. It’s a great option for leftovers and meal prep.
Cozy Comfort in a Bowl. It’s perfect for chilly days or slow evenings at home. One bowl feels like a big, cozy hug.

Key Ingredients and Substitutions

These are the main ingredients that make winter squash soup rich, cozy, and full of flavor. We’ve got you covered for easy swaps in case you’re missing something or want to change it up!

Cauliflower – Roasted cauliflower adds extra creaminess and body to the soup without making it heavy. Roast until golden for the best flavor. You can swap in parsnips or white beans for a similar creamy feel.
Kabocha Squash – Gives natural sweetness, a rich texture, and that cozy fall flavor everyone loves. Roasting helps to deepen the flavor. Butternut squash or acorn squash works well if kabocha isn’t available.
Onion – A large onion adds tons of flavor to the dish as it caramelizes in the oven with the other veggies. White or yellow onion are both great options!
Garlic – Roasting it makes the flavor soft, mellow, and slightly sweet. Shallots or roasted leeks can step in if needed.
Sage – Fresh sage is best but you can use dried sage if needed. Use one teaspoon of dried sage for every 1 tablespoon of fresh. Rosemary and thyme are also great flavor boosters in this soup!
Veggie Stock – Use a good-quality hot vegetable stock to blend with the roasted veggies. It adds flavor while helping to create a smooth, creamy consistency. Bonus points if you make your own vegetable broth!
Balsamic Vinegar – Lends a gentle tang that balances the sweetness of the squash. A small splash goes a long way. Apple cider vinegar or sherry vinegar are good substitutes.
Flaky Sea Salt – A sprinkle of flaky sea salt right before serving enhances all the flavors, adding a delicate crunch and a burst of salty goodness.

How to Make Soup with Kabocha Squash

This soup couldn’t be easier! Just chop, roast, and blend to make this yummy soup with kabocha squash.

Step 1: Get the Oven Ready – Preheat your oven to 390°F. Line a large baking tray with foil and set it aside.

Step 2: Prep the Veggies – Trim and roughly chop the cauliflower, including the stem and leaves. Peel, deseed, and chop the kabocha squash into bite-sized pieces. Cut the top off the garlic bulb, drizzle it with olive oil, and wrap it loosely in foil.

A knife is cutting the top off a head of garlic.

Drizzling olive oil over the top of a head of garlic with the cut off.

Then, Step 3: Season and Roast – Add the cauliflower, squash, onion, sage, and wrapped garlic to the baking tray. Drizzle with oil, season with salt and pepper, and give everything a good stir. Roast for about 45 minutes, stirring halfway, until the veggies are soft and nicely browned.

Roasted kabocha squash and onion on a sheet pan.

Step 4: Blend the Soup – Blend the roasted veggies with the hot stock in two batches until smooth. Pour each batch into a large saucepan, and save some roasted cauliflower if you want a topping.

Kabocha squash soup blended smoothly in a blender pitcher.

Step 5: Finish and Serve – Thin the soup with a little hot water if needed, then taste and adjust seasoning. Reheat gently and ladle into warm bowls. Top with roasted cauliflower, extra sage, and a drizzle of coconut milk if you like.

Soup Serving Tips and Toppings

These delicious ideas will help you get the most flavor out of your kabocha squash soup. From easy toppings to simple sides, they make every bowl even more cozy and satisfying.

Garnish with Homemade Croutons – Add some yummy croutons at the last minute. You can easily make your own! Just cut some old(ish) bread (we love using this herbed spelt bread!) in pieces or squares, drizzle them with olive oil and spices, and pop them in the oven at 350°F for 15 mins. It’s that easy!
Make It Simple – Sprinkle a bit of high quality olive oil (like in this lemon olive oil cake) and some cracked black pepper to finish off the soup. Rich and delicious!
Add Extra Crunch – Sneak in some roasted pumpkin seeds, toasted sesame or lightly browned sunflower seeds to make it nuttier and lend lots of satisfying texture.
Go for Greens – Stir fry some chopped kale or sautéed kale with some salt and a bit of balsamic vinegar until it’s bright green and full of flavor. Place it on top of (or as a savory side) your smooth squash soup and—voila! A little bit of pesto drizzle would also work!
Caramelized Onion Overload – If you love golden brown onions like we do, this is the perfect time to use them. Once your portion is served up, add a thin (or thick!) layer of cooked onions and enjoy!

Squash Variations

This recipe calls for Kabocha squash, but you have the option to choose from three different kinds. You can choose whichever you find on sale or simply use your favorite. Just make sure you pick a winter squash variety like:

Butternut Squash
Kuri Squash
Onion Squash
Crown Prince Squash

If you’re lucky, you might find the beautiful red Kuri squash. It’s also Japanese and has more of a chestnut flavor. They do best in soups (or just drizzled with olive oil and then roasted in the oven). Did we mention how cute they are?

FAQs

Do I have to roast the vegetables?

While you can eat butternut squash raw, roasting enhances the flavor by bringing out the natural sweetness of the squash and caramelizing the cauliflower and onions. If you’re short on time, you can skip the roasting and simmer the vegetables directly in the stock, but roasting adds a rich depth to the soup that you’ll love!

How do I store leftover kabocha squash soup?

You can store leftover soup in an airtight container in the refrigerator for up to 4-5 days. To freeze, let the soup cool completely before transferring it to a freezer-safe container. It will keep well in the freezer for up to 3 months. To reheat, simply thaw in the fridge overnight (if frozen) and warm on the stovetop or in the microwave.

Do you have to use oil in the soup? Can I make it without?

Nope, you don’t have to use oil at all. You can roast the squash and onions with a little vegetable broth or water instead, and the soup will still turn out creamy and flavorful. Roasted garlic also softens nicely without oil. It’s an easy swap if you want a lighter, oil-free soup.