In a large stock pot, bring vegetable stock to a boil. Add remaining ingredients and mix together until well incorporated. Bring to a boil, reduce heat to low, cover pot with lid, and simmer for 20-25 minutes or until squash is tender.
Transfer soup to a blender and blend until smooth. Serve warm and season with salt and pepper, if desired.
Recipe by Tone and Tighten at https://tone-and-tighten.com/butternut-squash-soup.html