Homemade Restaurant Quality Butternut Squash Soup
This restaurant-quality butternut squash soup combines roasted squash, caramelised vegetables, and nutty brown butter for a deeply satisfying flavour. The slow cooker method makes this elegant soup incredibly simple to prepare, allowing the flavours to meld beautifully whilst you go about your day. Finished with whipped crème fraîche, crispy bacon, and rosemary salt crostini, it's a show-stopping dish that tastes far more complicated than it is. Perfect for family suppers, entertaining guests, or batch-cooking for the freezer
Watch: Homemade Restaurant Quality Butternut Squash Soup
Original recipe video — click to play
Original method: approximately 45 minutes stovetop
Ingredients
For the Soup
- 1800 g butternut squash, peeled, deseeded, and cubed, peeled, deseeded, and cubed
Roast in oven at 200°C for 25 minutes before adding to slow cooker for deeper flavour
- 1 whole yellow onion, large, sliced
- 3 whole shallots, sliced
- 1 whole leek, sliced
White and light green parts only, cleaned thoroughly
- 7 whole carrots, medium, chopped
- 6 whole garlic cloves, smashed
- 60 ml avocado oil or neutral oil
For sautéing vegetables
- 2250 ml vegetable stock
Reduced from 2.4 litres for slow cooker
- 1 ½ tsp rosemary salt
- ½ tsp black pepper, freshly ground
- 115 g unsalted butter, browned
Add in final 30 minutes of cooking
Brown in a separate pan first for nutty flavour
- 240 ml heavy cream, warmed, warmed
Add in final 30 minutes of cooking
Warm gently before adding to prevent curdling
For the Rosemary Salt Crostini
- â…“ whole French bread loaf, sliced(optional)
Prepare whilst soup cooks or shortly before serving
- 60 ml olive oil(optional)
For preparing crostini
- 1 tsp rosemary salt(optional)
For crostini topping
For Garnish
- 225 g bacon, frozen and cubed, cut into cubes(optional)
Cook separately and add just before serving
Crisp up in a separate frying pan
- 15 g fresh chives, finely cut(optional)
Add just before serving
- 15 ml crème fraîche, whipped, whipped(optional)
Add just before serving
Method
- 1
Peel, deseed, and cube the butternut squash. Toss with 1 tablespoon of avocado oil, season with salt and pepper, and roast on a baking tray at 200°C for 25 minutes until golden and caramelised. Set aside.
~30 minsTip: Roasting develops deeper, sweeter flavours in the squash
- 2
Heat the remaining 3 tablespoons of avocado oil in a large frying pan over medium heat. Add the sliced onion, shallots, and leek. Sauté for 5–7 minutes until softened and fragrant.
~7 minsTip: This builds a flavour foundation for the soup
- 3
Add the chopped carrots and smashed garlic cloves to the pan. Continue cooking for another 3 minutes, stirring occasionally.
~3 mins - 4
Transfer the sautéed vegetables and roasted butternut squash to your slow cooker.
~2 mins - 5
Pour the vegetable stock into the slow cooker. Add the rosemary salt and black pepper. Stir well to combine.
~2 mins - 6
Cover and cook on LOW for 6 hours or HIGH for 4 hours, until the squash and vegetables are very tender and easily break apart.
~6 hrsTip: The longer LOW setting will develop more complex flavours
- 7
In a separate small pan, melt the unsalted butter over medium heat, swirling occasionally until it turns golden brown with a nutty aroma (about 5–7 minutes). Set aside.
~7 minsTip: Brown butter separately so you can control the exact moment to add it
- 8
When the soup is nearly done cooking, gently warm the heavy cream in a small saucepan over low heat. Do not allow it to boil.
~5 mins - 9
30 minutes before serving, add the browned butter and warmed heavy cream to the slow cooker. Stir gently to incorporate.
~1 minTip: Adding these late preserves their delicate texture and flavour
- 10
Using an immersion blender, blend the soup until smooth and velvety. Alternatively, carefully transfer the soup in batches to a food processor and blend until smooth, then return to the slow cooker.
~10 minsTip: Blend to your preferred consistency—some prefer a slightly chunky texture
- 11
Taste and adjust seasoning with additional rosemary salt and black pepper as needed.
~2 mins - 12Optional step
To prepare the rosemary salt crostini: slice the French bread diagonally into 0.5 cm thick slices. Brush both sides lightly with olive oil. Arrange on a baking tray and toast at 200°C for 8–10 minutes until golden and crisp. Remove from the oven and immediately sprinkle with rosemary salt.
~12 minsTip: Prepare whilst the soup is in its final stages or just before serving
- 13Optional step
In a frying pan, cook the cubed frozen bacon over medium-high heat, stirring occasionally, until crispy (about 8–10 minutes). Drain on kitchen paper.
~10 minsTip: Crispy bacon adds wonderful texture and flavour contrast
- 14Optional step
Ladle the soup into serving bowls. Top each bowl with a dollop of whipped crème fraîche, crispy bacon bits, fresh chives, and 1–2 rosemary salt crostini.
~3 minsTip: Add garnishes just before serving to maintain their texture
Nutrition
Detailed nutritional information is coming soon.
Frequently Asked Questions
Yes, this soup freezes beautifully for up to 3 months. Cool completely, then portion into freezer containers or bags. Thaw overnight in the fridge and reheat gently on the stovetop, stirring in a splash of fresh vegetable stock if needed. Freeze before adding the garnishes for best results
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