Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Peel and cube the butternut squash into 1-inch pieces, slice the apple, and roughly chop the yellow onion.
In a large bowl, toss the squash, apple, and onion with the olive oil, sea salt, black pepper, cinnamon, and thyme until evenly coated.
Spread the vegetable mixture onto the baking sheet in a single layer.
Season the chicken breast with a pinch of salt and pepper, then place it on the same baking sheet (or a separate small one) and roast everything for 25-30 minutes until the squash is tender and the chicken reaches an internal temperature of 165°F.
Remove from the oven and let the chicken rest for 5 minutes before shredding it with two forks.
Transfer the roasted squash, apple, and onion mixture into a high-speed blender.
Add the vegetable broth and blend on high until the soup is completely smooth and velvety.
Pour the soup into a bowl and top with the shredded chicken to serve.