In a medium bowl placed prepared cubed sweet potatoes, garlic, olive oil, parmesan cheese, and dried thyme.
Distribute the ingredients evenly to cover the sweet potatoes. Sprinkle with salt and pepper to taste.
Transfer sweet potato mixture to the prepared baking sheet. Spread out the potatoes so they are in a single layer. Roast for 40 minutes until sweet potatoes can be pierced with a sharp knife. Then set oven to broil until the top of the sweet potatoes start to brown, about 8-10 minutes.