Preheat oven to 400°F and line a large baking sheet with parchment paper.
Place the cubed butternut squash, diced onion, garlic clove, and chicken breast onto the prepared baking sheet.
Drizzle everything with olive oil and season with the sea salt and black pepper.
Roast for 25 to 30 minutes until the chicken is cooked through and the squash is fork-tender.
Remove the chicken from the tray and shred it finely using two forks.
Transfer the roasted squash, onion, and garlic into a high-speed blender.
Add the chicken bone broth, ground cinnamon, and ground nutmeg to the blender.
Process on high until the soup is completely smooth and creamy.
Pour the soup into a serving bowl and stir in the shredded chicken before enjoying.