Place cubed sweet potatoes in a baking pan or dish. Season with salt and pepper and coat with olive oil.
Bake for 20 25 minutes, until soft. Remove from oven and set aside.
In a dutch oven over medium heat, warm some olive oil.
Cook the chicken sausage until just browned.
Add in onion and mushrooms and cook for about 3 5 minutes, until softened.
Add in garlic, thyme, coriander, some sea salt and black pepper. Stir in and cook for about 1 minute.
Pour in chicken stock and bring to a boil.
Reduce heat and simmer for about 5 10 minutes.
Add in roasted sweet potatoes and kale.
Push the kale down into the soup so its submerged. Cook for about 3 5 minutes, until bright green and tender.