Preheat the oven to 400°F.
Wash and dry the sweet potatoes, then pierce them several times with a fork. Rub the sweet potatoes with olive oil, salt, and pepper. Place them on a baking sheet and bake for 45-60 minutes, or until tender.
Once the sweet potatoes are cooked, remove them from the oven and let them cool for about 10 minutes.
Cut each sweet potato in half lengthwise and scoop out the flesh into a mixing bowl, leaving a small border around the edges.
To the sweet potato flesh, add Greek yogurt, cheddar cheese, cinnamon, and nutmeg. Mix until smooth and well combined.
Spoon the sweet potato mixture back into the sweet potato skins.
In a small bowl, mix the chopped pecans with maple syrup. Sprinkle the pecan mixture over the filled sweet potatoes.
Return the stuffed sweet potatoes to the oven and bake for an additional 15-20 minutes, until heated through and the tops are slightly golden.
Serve warm and enjoy!