1. Preheat oven to 400 degrees F.
2. Bake sweet potatoes in the oven for 45 minutes or until sweet potato is soft.
3. When cooled, scoop out the centers of the potatoes and place them into a large bowl.
4. Begin to mash the potatoes. Before they are fully mashed, add margarine, cinnamon, and maple syrup.
5. Continue to mash sweet potatoes to the desired consistency.