Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the cubed butternut squash with olive oil, sea salt, and black pepper, then spread evenly on the baking sheet.
Roast the squash for 25 to 30 minutes until the edges are golden brown and the flesh is tender.
While the squash roasts, poach the chicken breast in simmering water for 12 to 15 minutes until the internal temperature reaches 165°F, then shred it using two forks.
In a medium pot over medium heat, sauté the diced onion and minced garlic until they are translucent and fragrant.
Add the roasted squash, chicken bone broth, cinnamon, and thyme to the pot and bring to a gentle simmer for 5 minutes.
Use an immersion blender to puree the soup until it reaches a smooth, velvety consistency.
Stir the shredded chicken into the soup and serve immediately while hot.