Roast the Squash: Preheat your oven to 400°F (200°C). Cut the butternut squash in half, remove the seeds, and drizzle with olive oil. Season with salt and pepper. Place it cut-side down on a baking sheet and roast for about 40-50 minutes, or until the flesh is tender.
Prepare the Soup Base: Once the squash is cooked, remove it from the oven and let it cool slightly. Scoop out the flesh and add it to a large pot. In the same pot, heat a bit of olive oil over medium heat and add the chopped onions. Sauté until they become translucent, then add the minced garlic and chopped jalapeño. Cook for an additional 2-3 minutes until fragrant.
Combine Ingredients: Add the roasted squash flesh to the pot along with the bone broth. Stir well and bring the mixture to a gentle simmer. Let it cook for about 10-15 minutes, allowing the flavors to meld together.
Blend the Soup: Using an immersion blender, puree the soup until smooth. If you don’t have an immersion blender, you can carefully transfer the soup in batches to a regular blender. Season with more salt and pepper to taste.
Serve and Enjoy: Ladle the soup into bowls and serve it hot with a side of crusty sourdough bread and butter. The creamy texture and the subtle sweetness of the butternut squash, combined with the perfect hint of spice from the jalapeño, create a heavenly dish that truly celebrates the flavors of fall.