Preheat your oven to 400ºF (200ºC). Peel and cut the sweet potatoes into thin slices.
Place the sweet potato slices in a resealable bag. Add the garlic, oil, butter, salt, pepper, Parmesan and Italian seasoning and shake until well coated.
Lightly butter a baking dish and arrange the coated sweet potatoes in a spiral. Sprinkle with fresh thyme and a little parmesan if desired.
Cook the sweet potatoes for 30-35 minutes. Serve your roasted sweet potatoes with parmesan garlic warm and sprinkle with fresh thyme
