Assemble: Add butternut to slow cooker along with everything except the coconut milk.
Cook: Stir to combine then cook for 6 to 8 hours on low, or 2 to 4 hours on high. Soup is ready when butternut is easily mashed with a fork.
Blend: Pick out the sprigs of thyme. Use a handheld immersion blender to puree the soup (alternatively, carefully transfer to a countertop blender and puree).
Serve: Stir in coconut milk and serve, optionally drizzling more coconut milk over soup after ladling into bowls.
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Notes
For stove-top soup, follow the instructions above, but instead, add everything to a large pot on the stove. Rather than a slow cooker, bring to a gentle simmer for 20 to 30 minutes or until the butternut is tender. Blend and finish as instructed above!Storage: This soup can be stored in the fridge for up to 5 days in an airtight container or frozen for 3 months. Just let it cool completely before storing.