Why not make this in the slow cooker instead? Cook on high for 3 hours.
If you want to make this a bit creamier, then add 100ml of coconut milk just before blending.
Add a little sweetness, and some autumn vibes, to this soup by adding apple. Dice it and cook at the same time as the sweet potato and butternut squash.
If you soup is a bit thick, add a little more stock to it.
You don't have to peel the sweet potato, as you can eat the skin - just make sure they are really well scrubbed clean.