Set your oven to 400°F and grease a large casserole dish lightly.
Heat the olive oil in a spacious skillet, then toss in the garlic and onion slices. Cook gently for about one minute until fragrant.
Add the kale and shredded chicken into the skillet and continue cooking on medium heat for around three minutes until the kale softens.
Pour the coconut milk in along with the fresh thyme, and bring the mixture to a boil.
Stir in the sliced sweet potatoes and sprinkle with sea salt. Lower the heat and simmer gently for 7 to 10 minutes.
Transfer the entire mixture carefully from the skillet into your prepared casserole dish.
Place in the oven and bake for 15 to 20 minutes, or until the sweet potatoes are tender and have absorbed the creamy coconut milk.